diff --git a/Dockerfile b/Dockerfile
index a49d5ed..3b9bc55 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
 FROM node:22-alpine AS build
 WORKDIR /app
 COPY package*.json ./
-RUN npm install
+RUN npm install --no-audit --no-fund
 COPY . .
-RUN npm run build
+RUN rm -f public/assets/terrain-sheet.png public/assets/flora-sheet.png public/assets/fauna-sheet.png public/assets/player-sheet.png && npm run build
 
 FROM nginx:1.27-alpine
 COPY nginx.conf /etc/nginx/conf.d/default.conf
diff --git a/README.md b/README.md
index 84804ec..058855d 100644
--- a/README.md
+++ b/README.md
@@ -1,23 +1,33 @@
 # Squirrel Forest
 
-A small 2D adventure-platformer prototype about a squirrel exploring a living woodland full of unusual flora, fauna and mushrooms.
+A 2D Phaser adventure-platformer about a squirrel exploring a living woodland full of flora, fauna and unusual mushrooms.
 
-## Prototype loop
+## Current prototype
 
-- Explore a continuous side-scrolling forest.
-- Run and jump across roots and branches.
-- Collect acorns while searching for five unusual mushrooms.
-- Pass through named woodland areas with ferns, flowers, frogs and butterflies.
-- Find all five forest caps to awaken the Moonlit Grove.
-- Follow the fireflies to complete the prototype trail.
-
-Everything in the first prototype uses Phaser-generated textures, so there are no external art dependencies yet.
+- Side-scrolling exploration across five named woodland areas.
+- Animated squirrel with separate visual and physics bodies.
+- Keyboard and multi-touch movement/jumping.
+- One-way log platforms: jump through from below and land from above.
+- Acorn collection and five mushroom discoveries.
+- Ambient frogs, hedgehogs, butterflies and fireflies.
+- Moonlit Grove completion sequence.
 
 ## Controls
 
 - **Move:** A/D or Left/Right
 - **Jump:** W, Up or Space
-- **Touch:** on-screen left/right/jump controls
+- **Touch:** independent left/right and jump controls
+
+## Structure
+
+- `src/main.js` — scene orchestration, world content, HUD and input.
+- `src/PlayerController.js` — squirrel physics/visual synchronization and animation state.
+- `src/worldConfig.js` — shared world/surface geometry and platform metadata.
+- `public/assets/player-game-sheet.png` — normalized squirrel animation sheet.
+- `public/assets/world-atlas.png/json` — optimized runtime atlas for terrain, flora and fauna.
+- `source-assets/` — preserved original source art sheets.
+
+The original large public source sheets are retained in Git for now, but the production Docker build removes them before Vite runs so they are not shipped to the browser.
 
 ## Run
 
@@ -34,13 +44,13 @@ npm run build
 
 ## Direction
 
-The intended feel is a cosy exploratory woodland adventure: dense layers of forest, lots of discoverable species, small traversal secrets and environmental storytelling rather than combat-first progression.
+The intended feel is a cosy exploratory woodland adventure focused on traversal, discovery, environmental storytelling and small animal interactions rather than combat-first progression.
 
 Good next slices:
 
-1. replace generated graphics with a hand-painted squirrel animation set;
-2. add climbable trunks and branch-to-branch movement;
-3. introduce a field-guide journal for discovered plants, fungi and animals;
-4. split the forest into richer biome pockets such as birch grove, damp hollow, old oak canopy and moonlit marsh;
-5. add tiny NPC animals and lightweight quests;
-6. add ambient audio, leaf particles, weather and a day/night cycle.
+1. climbable trunks and branch-to-branch movement;
+2. field-guide journal for discovered plants, fungi and animals;
+3. richer biome pockets such as birch grove, damp hollow, old oak canopy and moonlit marsh;
+4. lightweight animal NPC quests;
+5. acorn throwing / interaction using the existing player frames;
+6. re-enable audio behind a user gesture once the sound pass begins.
diff --git a/index.html b/index.html
index 85990f3..6c78765 100644
--- a/index.html
+++ b/index.html
@@ -10,7 +10,10 @@
     <div id="game"></div>
     <script>
       (() => {
+        window.__squirrelBooted = false;
+
         const showBootError = (message) => {
+          if (window.__squirrelBooted) return;
           if (document.getElementById('boot-error')) return;
           const box = document.createElement('div');
           box.id = 'boot-error';
diff --git a/package.json b/package.json
index e99c624..c6b89de 100644
--- a/package.json
+++ b/package.json
@@ -9,9 +9,9 @@
     "preview": "vite preview --host 0.0.0.0"
   },
   "dependencies": {
-    "phaser": "^3.90.0"
+    "phaser": "3.90.0"
   },
   "devDependencies": {
-    "vite": "^7.1.7"
+    "vite": "7.3.6"
   }
 }
diff --git a/src/PlayerController.js b/src/PlayerController.js
new file mode 100644
index 0000000..8d26834
--- /dev/null
+++ b/src/PlayerController.js
@@ -0,0 +1,99 @@
+import Phaser from 'phaser';
+
+export class PlayerController {
+  constructor(scene) {
+    this.scene = scene;
+    this.bodySprite = null;
+    this.visual = null;
+    this.wasGrounded = false;
+    this.landing = false;
+  }
+
+  create(x, y) {
+    this.bodySprite = this.scene.physics.add.sprite(x, y, 'player-body');
+    this.bodySprite.setAlpha(0);
+    this.bodySprite.setCollideWorldBounds(true);
+    this.bodySprite.setDragX(900);
+    this.bodySprite.setMaxVelocity(330, 760);
+    this.bodySprite.body.setSize(40, 68, true);
+
+    this.visual = this.scene.add.sprite(x, y, 'player-game', 0);
+    this.visual.setScale(0.42);
+    this.visual.setOrigin(0.5, 209 / 220);
+    this.visual.setDepth(12);
+    this.visual.play('squirrel-idle');
+
+    this.syncVisual();
+    return this.bodySprite;
+  }
+
+  setFacing(direction) {
+    if (!this.visual) return;
+    this.visual.setFlipX(direction < 0);
+  }
+
+  tryJump() {
+    if (!this.bodySprite?.body) return;
+
+    if (this.bodySprite.body.blocked.down || this.bodySprite.body.touching.down) {
+      this.bodySprite.setVelocityY(-520);
+      this.landing = false;
+      this.visual.play('squirrel-jump', true);
+    }
+  }
+
+  updateAnimation(grounded) {
+    if (!this.bodySprite?.body || !this.visual) return;
+
+    if (grounded && !this.wasGrounded) {
+      this.landing = true;
+      this.visual.play('squirrel-land', true);
+      this.visual.once('animationcomplete-squirrel-land', () => {
+        this.landing = false;
+      });
+    }
+
+    if (grounded) {
+      this.visual.setAngle(0);
+      if (!this.landing) {
+        if (Math.abs(this.bodySprite.body.velocity.x) > 35) {
+          this.visual.play('squirrel-run', true);
+        } else {
+          this.visual.play('squirrel-idle', true);
+        }
+      }
+    } else if (this.bodySprite.body.velocity.y < 0) {
+      this.landing = false;
+      this.visual.play('squirrel-jump', true);
+      this.visual.setAngle(
+        Phaser.Math.Clamp(this.bodySprite.body.velocity.x * 0.012, -5, 5)
+      );
+    } else {
+      this.landing = false;
+      this.visual.play('squirrel-fall', true);
+      this.visual.setAngle(
+        Phaser.Math.Clamp(this.bodySprite.body.velocity.x * 0.012, -5, 5)
+      );
+    }
+
+    this.wasGrounded = grounded;
+    this.syncVisual();
+  }
+
+  syncVisual() {
+    if (!this.bodySprite?.body || !this.visual) return;
+    this.visual.setPosition(this.bodySprite.x, this.bodySprite.body.bottom);
+  }
+
+  finish() {
+    if (!this.bodySprite?.body) return;
+
+    this.syncVisual();
+    this.bodySprite.setAcceleration(0, 0);
+    this.bodySprite.setVelocity(0, 0);
+    this.bodySprite.body.allowGravity = false;
+    this.bodySprite.body.enable = false;
+    this.visual.setAngle(0);
+    this.visual.setTint(0xfff2bd);
+  }
+}
diff --git a/src/main.js b/src/main.js
index a182b62..c0cc25c 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,18 +1,7 @@
 import Phaser from 'phaser';
 import './style.css';
-
-const WORLD_WIDTH = 5600;
-const WORLD_HEIGHT = 720;
-const GROUND_Y = 628;
-const GROUND_SURFACE_Y = GROUND_Y - 4;
-const GROUND_ART_SCALE = 0.98;
-const GROUND_ART_SURFACE_OFFSET = 20;
-const LOG_FRAME_HEIGHT = 79;
-const LOG_ART_SURFACE_OFFSET = 17;
-const LOG_COLLIDER_HEIGHT = 16;
-const LOG_SURFACE_LEFT = 15;
-const LOG_SURFACE_RIGHT = 266;
-const LOG_FRAME_WIDTH = 269;
+import { PlayerController } from './PlayerController.js';
+import { WORLD, GROUND_ART, BRANCH_POSITIONS, getLogGeometry } from './worldConfig.js';
 
 class ForestScene extends Phaser.Scene {
   constructor() {
@@ -22,8 +11,6 @@ class ForestScene extends Phaser.Scene {
     this.totalMushrooms = 5;
     this.touch = { left: false, right: false };
     this.touchPointers = { left: new Set(), right: new Set() };
-    this.wasGrounded = false;
-    this.landing = false;
   }
 
   preload() {
@@ -54,18 +41,18 @@ class ForestScene extends Phaser.Scene {
       frameWidth: 280,
       frameHeight: 220
     });
-    this.load.image('flora-sheet', '/assets/flora-sheet.png');
-    this.load.image('fauna-sheet', '/assets/fauna-sheet.png');
-    this.load.image('terrain-sheet', '/assets/terrain-sheet.png');
+    this.load.atlas('world-atlas', '/assets/world-atlas.png', '/assets/world-atlas.json');
   }
 
   create() {
-    this.physics.world.setBounds(0, 0, WORLD_WIDTH, WORLD_HEIGHT);
-    this.cameras.main.setBounds(0, 0, WORLD_WIDTH, WORLD_HEIGHT);
+    window.__squirrelBooted = true;
+    document.getElementById('boot-error')?.remove();
+
+    this.physics.world.setBounds(0, 0, WORLD.width, WORLD.height);
+    this.cameras.main.setBounds(0, 0, WORLD.width, WORLD.height);
     this.cameras.main.setBackgroundColor('#8fc7a2');
 
     this.createTextures();
-    this.createArtFrames();
     this.createAnimations();
     this.createBackdrop();
     this.createWorld();
@@ -79,9 +66,19 @@ class ForestScene extends Phaser.Scene {
     this.cameras.main.setDeadzone(180, 110);
     this.cameras.main.fadeIn(700, 16, 37, 29);
 
-    this.physics.add.collider(this.player, this.platforms);
-    this.physics.add.collider(this.acornGroup, this.platforms);
-    this.physics.add.collider(this.mushroomGroup, this.platforms);
+    this.physics.add.collider(this.player, this.groundPlatforms);
+    this.physics.add.collider(
+      this.player,
+      this.oneWayPlatforms,
+      undefined,
+      this.shouldCollideWithOneWayPlatform,
+      this
+    );
+
+    this.physics.add.collider(this.acornGroup, this.groundPlatforms);
+    this.physics.add.collider(this.acornGroup, this.oneWayPlatforms);
+    this.physics.add.collider(this.mushroomGroup, this.groundPlatforms);
+    this.physics.add.collider(this.mushroomGroup, this.oneWayPlatforms);
 
     this.physics.add.overlap(this.player, this.acornGroup, (_, acorn) => {
       acorn.disableBody(true, true);
@@ -110,49 +107,12 @@ class ForestScene extends Phaser.Scene {
     this.physics.add.overlap(this.player, this.groveTrigger, () => {
       if (this.mushrooms < this.totalMushrooms || this.finished) return;
       this.finished = true;
-      this.player.setVelocityX(0);
-      this.playerVisual.setTint(0xfff2bd);
+      this.playerController.finish();
       this.showEnding();
     });
   }
 
 
-  createArtFrames() {
-    const addFrame = (textureKey, name, x, y, width, height) => {
-      this.textures.get(textureKey).add(name, 0, x, y, width, height);
-    };
-
-
-    addFrame('terrain-sheet', 'ground-main', 24, 32, 341, 107);
-    // Interior-only repeat crop: removes the standalone tile's visible
-    // left/right border so adjacent ground pieces join cleanly.
-    addFrame('terrain-sheet', 'ground-repeat', 52, 32, 285, 107);
-    addFrame('terrain-sheet', 'log-platform', 21, 327, 269, 79);
-    addFrame('terrain-sheet', 'root-platform', 1023, 672, 402, 168);
-
-    addFrame('flora-sheet', 'bush', 16, 28, 244, 149);
-    addFrame('flora-sheet', 'fern-cluster', 659, 19, 169, 154);
-    addFrame('flora-sheet', 'bluebells', 15, 180, 100, 131);
-    addFrame('flora-sheet', 'mush-red', 14, 321, 168, 200);
-    addFrame('flora-sheet', 'mush-brown', 388, 328, 195, 195);
-    addFrame('flora-sheet', 'mush-orange', 560, 335, 117, 184);
-    addFrame('flora-sheet', 'mush-purple', 685, 331, 114, 188);
-    addFrame('flora-sheet', 'mush-blue', 1088, 336, 149, 186);
-    addFrame('flora-sheet', 'acorn-art', 178, 567, 58, 71);
-
-    const frogFrames = [
-      [72, 538, 99, 88], [231, 537, 105, 89], [422, 535, 155, 96],
-      [594, 505, 169, 95], [845, 547, 118, 79]
-    ];
-    frogFrames.forEach(([x, y, w, h], i) => addFrame('fauna-sheet', `frog${i}`, x, y, w, h));
-
-    const hedgehogFrames = [
-      [18, 66, 139, 106], [169, 64, 131, 108], [310, 63, 131, 105],
-      [449, 66, 129, 107], [592, 57, 120, 115], [729, 67, 105, 105]
-    ];
-    hedgehogFrames.forEach(([x, y, w, h], i) => addFrame('fauna-sheet', `hedgehog${i}`, x, y, w, h));
-  }
-
   createAnimations() {
     const frames = (texture, names) => names.map(frame => ({ key: texture, frame }));
 
@@ -193,7 +153,7 @@ class ForestScene extends Phaser.Scene {
 
     this.anims.create({
       key: 'frog-hop',
-      frames: frames('fauna-sheet', ['frog0', 'frog1', 'frog2', 'frog3', 'frog4']),
+      frames: frames('world-atlas', ['frog0', 'frog1', 'frog2', 'frog3', 'frog4']),
       frameRate: 7,
       repeat: -1,
       repeatDelay: 1400
@@ -201,7 +161,7 @@ class ForestScene extends Phaser.Scene {
 
     this.anims.create({
       key: 'hedgehog-walk',
-      frames: frames('fauna-sheet', ['hedgehog0', 'hedgehog1', 'hedgehog2', 'hedgehog3', 'hedgehog4', 'hedgehog5']),
+      frames: frames('world-atlas', ['hedgehog0', 'hedgehog1', 'hedgehog2', 'hedgehog3', 'hedgehog4', 'hedgehog5']),
       frameRate: 8,
       repeat: -1
     });
@@ -210,95 +170,10 @@ class ForestScene extends Phaser.Scene {
   createTextures() {
     const g = this.make.graphics({ add: false });
 
-    g.clear();
     g.fillStyle(0xffffff, 1);
     g.fillRect(0, 0, 44, 72);
     g.generateTexture('player-body', 44, 72);
 
-    g.clear();
-    g.fillStyle(0x6e482b, 1);
-    g.fillEllipse(24, 30, 35, 24);
-    g.fillStyle(0x9c6840, 1);
-    g.fillEllipse(30, 25, 28, 20);
-    g.fillStyle(0x6e482b, 1);
-    g.fillCircle(42, 20, 10);
-    g.fillTriangle(39, 13, 43, 3, 47, 14);
-    g.fillStyle(0xf3d5a0, 1);
-    g.fillCircle(46, 21, 3);
-    g.fillStyle(0x2c2018, 1);
-    g.fillCircle(48, 19, 1.5);
-    g.fillStyle(0x8c5b35, 1);
-    g.fillEllipse(9, 25, 22, 38);
-    g.lineStyle(5, 0x8c5b35, 1);
-    g.beginPath();
-    g.arc(7, 20, 16, Math.PI * 0.6, Math.PI * 1.65);
-    g.strokePath();
-    g.fillStyle(0x4d321f, 1);
-    g.fillRect(17, 38, 7, 12);
-    g.fillRect(33, 38, 7, 12);
-    g.generateTexture('squirrel', 58, 56);
-
-    g.clear();
-    g.fillStyle(0x8f5a2b, 1);
-    g.fillEllipse(10, 13, 15, 13);
-    g.fillStyle(0x4f341c, 1);
-    g.fillRect(6, 2, 8, 5);
-    g.generateTexture('acorn', 20, 22);
-
-    g.clear();
-    g.fillStyle(0xf4ddba, 1);
-    g.fillRoundedRect(12, 14, 7, 18, 3);
-    g.fillStyle(0xb94846, 1);
-    g.fillEllipse(16, 14, 28, 17);
-    g.fillStyle(0xffe8c8, 1);
-    g.fillCircle(10, 10, 2);
-    g.fillCircle(18, 8, 2);
-    g.fillCircle(23, 13, 2);
-    g.generateTexture('mushroom-red', 32, 34);
-
-    g.clear();
-    g.fillStyle(0xe8dbba, 1);
-    g.fillRoundedRect(12, 14, 7, 18, 3);
-    g.fillStyle(0x76528f, 1);
-    g.fillEllipse(16, 14, 28, 17);
-    g.fillStyle(0xdcccf0, 1);
-    g.fillCircle(10, 10, 2);
-    g.fillCircle(20, 9, 2);
-    g.generateTexture('mushroom-purple', 32, 34);
-
-    g.clear();
-    g.fillStyle(0xe0cfaa, 1);
-    g.fillRoundedRect(12, 13, 7, 19, 3);
-    g.fillStyle(0xe1a53a, 1);
-    g.fillEllipse(16, 13, 28, 16);
-    g.fillStyle(0xffefaa, 1);
-    g.fillCircle(10, 10, 2);
-    g.fillCircle(21, 10, 2);
-    g.generateTexture('mushroom-gold', 32, 34);
-
-    g.clear();
-    g.fillStyle(0x35684b, 1);
-    for (let i = 0; i < 5; i++) {
-      g.fillEllipse(17 + i * 2, 22 - i * 4, 9, 25);
-    }
-    g.fillStyle(0x6aa56d, 1);
-    for (let i = 0; i < 4; i++) {
-      g.fillEllipse(12 + i * 6, 25 - (i % 2) * 6, 7, 19);
-    }
-    g.generateTexture('fern', 42, 44);
-
-    g.clear();
-    g.fillStyle(0xe8b7c7, 1);
-    for (let i = 0; i < 5; i++) {
-      const a = (Math.PI * 2 * i) / 5;
-      g.fillCircle(9 + Math.cos(a) * 5, 9 + Math.sin(a) * 5, 4);
-    }
-    g.fillStyle(0xf5d067, 1);
-    g.fillCircle(9, 9, 3);
-    g.fillStyle(0x477654, 1);
-    g.fillRect(8, 14, 2, 14);
-    g.generateTexture('flower', 18, 30);
-
     g.clear();
     g.fillStyle(0x6c4429, 1);
     g.fillRoundedRect(32, 0, 28, 120, 10);
@@ -312,13 +187,6 @@ class ForestScene extends Phaser.Scene {
     g.fillCircle(55, 50, 28);
     g.generateTexture('tree', 92, 120);
 
-    g.clear();
-    g.fillStyle(0x393024, 1);
-    g.fillRoundedRect(0, 0, 140, 22, 10);
-    g.fillStyle(0x567645, 1);
-    g.fillRect(0, 0, 140, 7);
-    g.generateTexture('branch', 140, 22);
-
     g.clear();
     g.fillStyle(0xb4d9f2, 0.9);
     g.fillEllipse(8, 8, 12, 7);
@@ -334,117 +202,87 @@ class ForestScene extends Phaser.Scene {
     g.fillCircle(6, 6, 6);
     g.generateTexture('firefly', 12, 12);
 
-    g.clear();
-    g.fillStyle(0x517a4e, 1);
-    g.fillEllipse(15, 16, 24, 16);
-    g.fillStyle(0x75995b, 1);
-    g.fillCircle(18, 10, 8);
-    g.fillStyle(0x1e2c22, 1);
-    g.fillCircle(15, 8, 1.5);
-    g.fillCircle(21, 8, 1.5);
-    g.generateTexture('frog', 30, 24);
-
     g.destroy();
   }
 
   createBackdrop() {
-    this.add.rectangle(WORLD_WIDTH / 2, 270, WORLD_WIDTH, 540, 0x8fc7a2).setScrollFactor(0.05);
+    this.add.rectangle(WORLD.width / 2, 270, WORLD.width, 540, 0x8fc7a2).setScrollFactor(0.05);
 
     const far = this.add.graphics().setScrollFactor(0.12);
     far.fillStyle(0x719f78, 1);
-    for (let x = -100; x < WORLD_WIDTH + 300; x += 170) {
+    for (let x = -100; x < WORLD.width + 300; x += 170) {
       far.fillCircle(x, 350 + (x % 3) * 8, 180);
     }
 
     const mist = this.add.graphics().setScrollFactor(0.22);
     mist.fillStyle(0xd9ead6, 0.28);
-    for (let x = 0; x < WORLD_WIDTH; x += 500) {
+    for (let x = 0; x < WORLD.width; x += 500) {
       mist.fillEllipse(x, 480 + (x % 2) * 20, 520, 120);
     }
 
     const canopy = this.add.graphics().setScrollFactor(0.35);
     canopy.fillStyle(0x315f45, 0.95);
-    for (let x = -120; x < WORLD_WIDTH + 300; x += 150) {
+    for (let x = -120; x < WORLD.width + 300; x += 150) {
       canopy.fillCircle(x, 140 + ((x / 150) % 3) * 28, 110);
     }
 
-    for (let x = 200; x < WORLD_WIDTH; x += 720) {
+    for (let x = 200; x < WORLD.width; x += 720) {
       this.add.image(x, 455, 'tree').setScale(2.5).setAlpha(0.58).setScrollFactor(0.55).setOrigin(0.5, 1);
     }
   }
 
   createWorld() {
-    this.platforms = this.physics.add.staticGroup();
+    this.groundPlatforms = this.physics.add.staticGroup();
+    this.oneWayPlatforms = this.physics.add.staticGroup();
 
     // Keep the physics plane and the illustrated grass line on the exact same Y.
     // In ground-main the continuous walkable grass line is 20 source pixels
     // below the cropped frame top.
     const ground = this.add.rectangle(
-      WORLD_WIDTH / 2,
-      GROUND_SURFACE_Y + 50,
-      WORLD_WIDTH,
+      WORLD.width / 2,
+      WORLD.groundSurfaceY + 50,
+      WORLD.width,
       100,
       0x263c2d,
       0
     );
     this.physics.add.existing(ground, true);
-    this.platforms.add(ground);
+    this.groundPlatforms.add(ground);
 
-    const groundArtY = GROUND_SURFACE_Y - (GROUND_ART_SURFACE_OFFSET * GROUND_ART_SCALE);
-    const groundTileWidth = 285 * GROUND_ART_SCALE;
-    const groundTileStep = groundTileWidth - 3; // tiny overlap avoids antialias hairlines
-    for (let x = groundTileWidth / 2; x < WORLD_WIDTH + groundTileWidth; x += groundTileStep) {
-      this.add.image(x, groundArtY, 'terrain-sheet', 'ground-repeat')
+    const groundArtY = WORLD.groundSurfaceY - (GROUND_ART.surfaceOffset * GROUND_ART.scale);
+    const groundTileWidth = GROUND_ART.repeatFrameWidth * GROUND_ART.scale;
+    const groundTileStep = groundTileWidth - GROUND_ART.overlap; // tiny overlap avoids antialias hairlines
+    for (let x = groundTileWidth / 2; x < WORLD.width + groundTileWidth; x += groundTileStep) {
+      this.add.image(x, groundArtY, 'world-atlas', 'ground-repeat')
         .setOrigin(0.5, 0)
-        .setScale(GROUND_ART_SCALE)
+        .setScale(GROUND_ART.scale)
         .setDepth(3);
     }
 
-    const branchPositions = [
-      [500, 545], [720, 505], [900, 465],
-      [1260, 545], [1480, 505], [1680, 465],
-      [2050, 545], [2260, 505], [2470, 465],
-      [2900, 545], [3140, 505], [3370, 465],
-      [3800, 545], [4010, 505], [4230, 465],
-      [4680, 545], [4890, 505], [5100, 465]
-    ];
-
-    // branchPositions store the intended walkable surface Y, not the
-    // collider centre. The illustrated log's usable top edge is 17 source
-    // pixels below its cropped frame top, so derive art + physics from the
-    // same surface coordinate.
-    branchPositions.forEach(([x, surfaceY], index) => {
+    BRANCH_POSITIONS.forEach(([x, surfaceY], index) => {
       const scale = index % 3 === 0 ? 0.62 : 0.55;
-      const visualY = surfaceY + ((LOG_FRAME_HEIGHT / 2 - LOG_ART_SURFACE_OFFSET) * scale);
+      const geometry = getLogGeometry(x, surfaceY, scale);
 
-      const visual = this.add.image(x, visualY, 'terrain-sheet', 'log-platform')
+      this.add.image(x, geometry.visualY, 'world-atlas', 'log-platform')
         .setScale(scale)
         .setDepth(6);
 
-      const surfaceWidth = (LOG_SURFACE_RIGHT - LOG_SURFACE_LEFT) * scale;
-      // The visible moss cap is biased left relative to the cropped log frame.
-      // Keep the corrected surface width, but mirror the centre correction so
-      // the collider follows the artwork rather than drifting right.
-      const surfaceCenterOffset = -(
-        ((LOG_SURFACE_LEFT + LOG_SURFACE_RIGHT) / 2) - (LOG_FRAME_WIDTH / 2)
-      ) * scale;
-
       const collider = this.add.rectangle(
-        x + surfaceCenterOffset,
-        surfaceY + (LOG_COLLIDER_HEIGHT / 2),
-        surfaceWidth,
-        LOG_COLLIDER_HEIGHT,
+        geometry.colliderX,
+        geometry.colliderY,
+        geometry.colliderWidth,
+        geometry.colliderHeight,
         0x000000,
         0
       );
       this.physics.add.existing(collider, true);
-      this.platforms.add(collider);
+      this.oneWayPlatforms.add(collider);
     });
 
-    for (let x = 120; x < WORLD_WIDTH - 120; x += 180) {
+    for (let x = 120; x < WORLD.width - 120; x += 180) {
       const n = Math.sin(x * 0.013) + Math.cos(x * 0.021);
       if (n > -0.3) {
-        this.add.image(x, GROUND_Y - 2, 'flora-sheet', 'fern-cluster')
+        this.add.image(x, WORLD.groundSurfaceY - 2, 'world-atlas', 'fern-cluster')
           .setOrigin(0.5, 1)
           .setScale(0.2 + ((x % 90) / 900))
           .setAlpha(0.96)
@@ -452,14 +290,14 @@ class ForestScene extends Phaser.Scene {
       }
 
       if (x % 540 < 190) {
-        this.add.image(x + 65, GROUND_Y - 2, 'flora-sheet', 'bluebells')
+        this.add.image(x + 65, WORLD.groundSurfaceY - 2, 'world-atlas', 'bluebells')
           .setOrigin(0.5, 1)
           .setScale(0.2)
           .setDepth(5);
       }
 
       if (x % 900 < 190) {
-        this.add.image(x - 65, GROUND_Y - 3, 'flora-sheet', 'bush')
+        this.add.image(x - 65, WORLD.groundSurfaceY - 3, 'world-atlas', 'bush')
           .setOrigin(0.5, 1)
           .setScale(0.34)
           .setDepth(4);
@@ -491,28 +329,20 @@ class ForestScene extends Phaser.Scene {
   }
 
   createPlayer() {
-    // Keep physics independent from animation artwork. The body is a simple,
-    // stable capsule-like rectangle while the squirrel art follows it.
-    this.player = this.physics.add.sprite(160, 520, 'player-body');
-    this.player.setAlpha(0);
-    this.player.setCollideWorldBounds(true);
-    this.player.setDragX(900);
-    this.player.setMaxVelocity(330, 760);
-    this.player.body.setSize(40, 68, true);
-
-    this.playerVisual = this.add.sprite(160, 520, 'player-game', 0);
-    this.playerVisual.setScale(0.42);
-    // Every normalized player frame has its paw baseline at source y=209.
-    // Pin that exact baseline to the physics body's bottom.
-    this.playerVisual.setOrigin(0.5, 209 / 220);
-    this.playerVisual.setDepth(12);
-    this.playerVisual.play('squirrel-idle');
-    this.syncPlayerVisual();
+    this.playerController = new PlayerController(this);
+    this.player = this.playerController.create(160, 520);
+    this.playerVisual = this.playerController.visual;
   }
 
-  syncPlayerVisual() {
-    if (!this.player?.body || !this.playerVisual) return;
-    this.playerVisual.setPosition(this.player.x, this.player.body.bottom);
+  shouldCollideWithOneWayPlatform(player, platform) {
+    if (!player?.body || !platform?.body) return false;
+    if (player.body.velocity.y < 0) return false;
+
+    const previousBottom = player.body.prev?.y !== undefined
+      ? player.body.prev.y + player.body.height
+      : player.body.bottom;
+
+    return previousBottom <= platform.body.top + 8;
   }
 
   createCollectibles() {
@@ -524,7 +354,7 @@ class ForestScene extends Phaser.Scene {
       [3370, 345], [3610, 555], [3800, 440], [4050, 555], [4230, 365],
       [4470, 555], [4680, 460], [4910, 555], [5100, 370]
     ].forEach(([x, y], i) => {
-      const acorn = this.acornGroup.create(x, y, 'flora-sheet', 'acorn-art');
+      const acorn = this.acornGroup.create(x, y, 'world-atlas', 'acorn-art');
       acorn.setScale(0.62);
       acorn.setBounce(0.2);
       acorn.body.setSize(38, 48, true);
@@ -541,7 +371,7 @@ class ForestScene extends Phaser.Scene {
     ];
 
     mushrooms.forEach(([x, y, frame, name], index) => {
-      const mushroom = this.mushroomGroup.create(x, y, 'flora-sheet', frame);
+      const mushroom = this.mushroomGroup.create(x, y, 'world-atlas', frame);
       const scale = frame === 'mush-blue' ? 0.3 : 0.28;
       mushroom.setScale(scale);
       mushroom.setData('name', name);
@@ -578,7 +408,7 @@ class ForestScene extends Phaser.Scene {
     });
 
     [1120, 2600, 3980].forEach((x, i) => {
-      const frog = this.add.sprite(x, GROUND_Y - 2, 'fauna-sheet', 'frog0')
+      const frog = this.add.sprite(x, WORLD.groundSurfaceY - 2, 'world-atlas', 'frog0')
         .setOrigin(0.5, 1)
         .setScale(0.32)
         .setDepth(7);
@@ -587,7 +417,7 @@ class ForestScene extends Phaser.Scene {
     });
 
     [1450, 3450].forEach((x, i) => {
-      const hedgehog = this.add.sprite(x, GROUND_Y - 3, 'fauna-sheet', 'hedgehog0')
+      const hedgehog = this.add.sprite(x, WORLD.groundSurfaceY - 3, 'world-atlas', 'hedgehog0')
         .setOrigin(0.5, 1)
         .setScale(0.34)
         .setDepth(7)
@@ -736,11 +566,7 @@ class ForestScene extends Phaser.Scene {
   }
 
   tryJump() {
-    if (!this.player?.body) return;
-    if (this.player.body.blocked.down || this.player.body.touching.down) {
-      this.player.setVelocityY(-520);
-      this.playerVisual.play('squirrel-jump', true);
-    }
+    this.playerController?.tryJump();
   }
 
   showDiscovery(name) {
@@ -808,45 +634,16 @@ class ForestScene extends Phaser.Scene {
 
     if (left && !right) {
       this.player.setAccelerationX(-1050);
-      this.playerVisual.setFlipX(true);
+      this.playerController.setFacing(-1);
     } else if (right && !left) {
       this.player.setAccelerationX(1050);
-      this.playerVisual.setFlipX(false);
+      this.playerController.setFacing(1);
     } else {
       this.player.setAccelerationX(0);
     }
 
     const grounded = this.player.body.blocked.down || this.player.body.touching.down;
-
-    if (grounded && !this.wasGrounded) {
-      this.landing = true;
-      this.playerVisual.play('squirrel-land', true);
-      this.playerVisual.once('animationcomplete-squirrel-land', () => {
-        this.landing = false;
-      });
-    }
-
-    if (grounded) {
-      this.playerVisual.setAngle(0);
-      if (!this.landing) {
-        if (Math.abs(this.player.body.velocity.x) > 35) {
-          this.playerVisual.play('squirrel-run', true);
-        } else {
-          this.playerVisual.play('squirrel-idle', true);
-        }
-      }
-    } else if (this.player.body.velocity.y < 0) {
-      this.landing = false;
-      this.player.play('squirrel-jump', true);
-      this.playerVisual.setAngle(Phaser.Math.Clamp(this.player.body.velocity.x * 0.012, -5, 5));
-    } else {
-      this.landing = false;
-      this.playerVisual.play('squirrel-fall', true);
-      this.playerVisual.setAngle(Phaser.Math.Clamp(this.player.body.velocity.x * 0.012, -5, 5));
-    }
-
-    this.wasGrounded = grounded;
-    this.syncPlayerVisual();
+    this.playerController.updateAnimation(grounded);
 
     this.acornGroup.children.iterate(acorn => {
       if (!acorn?.active) return;
diff --git a/src/worldConfig.js b/src/worldConfig.js
new file mode 100644
index 0000000..5ae8c70
--- /dev/null
+++ b/src/worldConfig.js
@@ -0,0 +1,53 @@
+export const WORLD = {
+  width: 5600,
+  height: 720,
+  groundSurfaceY: 624
+};
+
+export const GROUND_ART = {
+  scale: 0.98,
+  surfaceOffset: 20,
+  repeatFrameWidth: 285,
+  overlap: 3
+};
+
+export const LOG_PLATFORM = {
+  frameWidth: 269,
+  frameHeight: 79,
+  surfaceOffsetY: 17,
+  colliderHeight: 16,
+  surfaceLeft: 15,
+  surfaceRight: 266
+};
+
+export const BRANCH_POSITIONS = [
+  [500, 545], [720, 505], [900, 465],
+  [1260, 545], [1480, 505], [1680, 465],
+  [2050, 545], [2260, 505], [2470, 465],
+  [2900, 545], [3140, 505], [3370, 465],
+  [3800, 545], [4010, 505], [4230, 465],
+  [4680, 545], [4890, 505], [5100, 465]
+];
+
+export function getLogGeometry(x, surfaceY, scale) {
+  const visualY = surfaceY
+    + ((LOG_PLATFORM.frameHeight / 2 - LOG_PLATFORM.surfaceOffsetY) * scale);
+
+  const colliderWidth = (
+    LOG_PLATFORM.surfaceRight - LOG_PLATFORM.surfaceLeft
+  ) * scale;
+
+  const surfaceCenterOffset = -(
+    (
+      (LOG_PLATFORM.surfaceLeft + LOG_PLATFORM.surfaceRight) / 2
+    ) - (LOG_PLATFORM.frameWidth / 2)
+  ) * scale;
+
+  return {
+    visualY,
+    colliderX: x + surfaceCenterOffset,
+    colliderY: surfaceY + (LOG_PLATFORM.colliderHeight / 2),
+    colliderWidth,
+    colliderHeight: LOG_PLATFORM.colliderHeight
+  };
+}