===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,362 @@
-/****
+/**** 
+* Classes
+****/ 
+// Collectible (Star)
+var Collectible = Container.expand(function () {
+	var self = Container.call(this);
+	var sprite = self.attachAsset('star', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = 80;
+	self.height = 80;
+	return self;
+});
+// Enemy (Alien or Robot)
+var Enemy = Container.expand(function () {
+	var self = Container.call(this);
+	var sprite = self.attachAsset('alien', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = ENEMY_WIDTH;
+	self.height = ENEMY_HEIGHT;
+	self.vx = 3 + Math.random() * 2;
+	self.direction = Math.random() < 0.5 ? -1 : 1;
+	self.lastX = 0;
+	self.update = function () {
+		self.x += self.vx * self.direction;
+		// Turn at platform edges
+		for (var i = 0; i < platforms.length; ++i) {
+			var p = platforms[i];
+			if (Math.abs(self.y - p.y) < 10) {
+				if (self.x - self.width / 2 < p.x - p.width / 2 || self.x + self.width / 2 > p.x + p.width / 2) {
+					self.direction *= -1;
+				}
+			}
+		}
+		// Clamp to world
+		if (self.x < ENEMY_WIDTH / 2) self.direction = 1;
+		if (self.x > 2048 - ENEMY_WIDTH / 2) self.direction = -1;
+		self.lastX = self.x;
+	};
+	return self;
+});
+// Platform
+var Platform = Container.expand(function () {
+	var self = Container.call(this);
+	var sprite = self.attachAsset('platform', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = PLATFORM_WIDTH;
+	self.height = PLATFORM_HEIGHT;
+	return self;
+});
+// --- ASSET CLASSES --- 
+// Player (Astronaut)
+var Player = Container.expand(function () {
+	var self = Container.call(this);
+	var sprite = self.attachAsset('astronaut', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = PLAYER_WIDTH;
+	self.height = PLAYER_HEIGHT;
+	self.vx = 0;
+	self.vy = 0;
+	self.isOnGround = false;
+	self.lastY = 0;
+	self.lastX = 0;
+	self.lastWasIntersectingEnemy = false;
+	self.lastWasIntersectingRocket = false;
+	self.update = function () {
+		// Gravity
+		self.vy += GRAVITY;
+		// Move
+		self.x += self.vx;
+		self.y += self.vy;
+		// Clamp to world bounds
+		if (self.x < PLAYER_WIDTH / 2) self.x = PLAYER_WIDTH / 2;
+		if (self.x > 2048 - PLAYER_WIDTH / 2) self.x = 2048 - PLAYER_WIDTH / 2;
+		if (self.y > 2732 - PLAYER_HEIGHT / 2) self.y = 2732 - PLAYER_HEIGHT / 2;
+		// Platform collision
+		self.isOnGround = false;
+		for (var i = 0; i < platforms.length; ++i) {
+			var p = platforms[i];
+			// Only check if falling
+			if (self.vy >= 0 && self.y + self.height / 2 > p.y - p.height / 2 && self.y + self.height / 2 - self.vy <= p.y - p.height / 2) {
+				// Check horizontal overlap
+				if (self.x + self.width / 2 > p.x - p.width / 2 && self.x - self.width / 2 < p.x + p.width / 2) {
+					// Land on platform
+					self.y = p.y - p.height / 2 - self.height / 2;
+					self.vy = 0;
+					self.isOnGround = true;
+					isJumping = false;
+				}
+			}
+		}
+		// Enemy collision
+		var hitEnemy = null;
+		for (var i = 0; i < enemies.length; ++i) {
+			var e = enemies[i];
+			if (self.intersects(e)) {
+				// Check if landing on top
+				if (self.lastY + self.height / 2 <= e.y - e.height / 2 && self.y + self.height / 2 > e.y - e.height / 2 && self.vy > 0) {
+					// Defeat enemy
+					hitEnemy = e;
+					break;
+				} else {
+					// Hit from side or below: lose life
+					if (!self.lastWasIntersectingEnemy) {
+						loseLife();
+						self.lastWasIntersectingEnemy = true;
+					}
+				}
+			} else {
+				self.lastWasIntersectingEnemy = false;
+			}
+		}
+		if (hitEnemy) {
+			// Remove enemy, bounce up
+			score += 100;
+			updateScore();
+			hitEnemy.destroy();
+			enemies.splice(enemies.indexOf(hitEnemy), 1);
+			self.vy = JUMP_VELOCITY / 1.5;
+		}
+		// Collectibles
+		for (var i = collectibles.length - 1; i >= 0; --i) {
+			var c = collectibles[i];
+			if (self.intersects(c)) {
+				score += 50;
+				updateScore();
+				c.destroy();
+				collectibles.splice(i, 1);
+			}
+		}
+		// Rocket (level end)
+		if (!self.lastWasIntersectingRocket && self.intersects(rocket)) {
+			// Win!
+			LK.showYouWin();
+			lastYouWin = true;
+		}
+		self.lastWasIntersectingRocket = self.intersects(rocket);
+		// Fall off screen
+		if (self.y > 2732) {
+			loseLife();
+		}
+		// Update last positions
+		self.lastY = self.y;
+		self.lastX = self.x;
+	};
+	return self;
+});
+// Rocket (Level End)
+var Rocket = Container.expand(function () {
+	var self = Container.call(this);
+	var sprite = self.attachAsset('rocket', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = 180;
+	self.height = 260;
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
+// --- UI ---
 var game = new LK.Game({
 	backgroundColor: 0x000000
-});
\ No newline at end of file
+});
+
+/**** 
+* Game Code
+****/ 
+// --- Astro Jump: Space Platformer Main Game Logic --- 
+// --- GLOBALS --- 
+var GRAVITY = 0.3; // Low gravity for floaty jumps
+var JUMP_VELOCITY = -18; // High jump
+var PLAYER_MOVE_SPEED = 12;
+var PLAYER_START_LIVES = 3;
+var PLAYER_WIDTH = 120;
+var PLAYER_HEIGHT = 140;
+var ENEMY_WIDTH = 110;
+var ENEMY_HEIGHT = 110;
+var PLATFORM_WIDTH = 320;
+var PLATFORM_HEIGHT = 60;
+var LEVEL_END_X = 1800;
+var LEVEL_END_Y = 400;
+var platforms = [];
+var enemies = [];
+var collectibles = [];
+var player = null;
+var rocket = null;
+var score = 0;
+var lives = PLAYER_START_LIVES;
+var scoreTxt = null;
+var livesTxt = null;
+var isJumping = false;
+var isFalling = false;
+var jumpKeyDown = false;
+var dragNode = null;
+var lastGameOver = false;
+var lastYouWin = false;
+// --- UI --- 
+scoreTxt = new Text2('Score: 0', {
+	size: 90,
+	fill: "#fff"
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+livesTxt = new Text2('Lives: ' + lives, {
+	size: 90,
+	fill: "#fff"
+});
+livesTxt.anchor.set(0.5, 0);
+LK.gui.topRight.addChild(livesTxt);
+// --- LEVEL SETUP --- 
+function setupLevel() {
+	// Clear previous
+	for (var i = 0; i < platforms.length; ++i) platforms[i].destroy();
+	for (var i = 0; i < enemies.length; ++i) enemies[i].destroy();
+	for (var i = 0; i < collectibles.length; ++i) collectibles[i].destroy();
+	if (player) player.destroy();
+	if (rocket) rocket.destroy();
+	platforms = [];
+	enemies = [];
+	collectibles = [];
+	// Platforms
+	var platData = [{
+		x: 400,
+		y: 2200
+	}, {
+		x: 800,
+		y: 1800
+	}, {
+		x: 1200,
+		y: 1500
+	}, {
+		x: 1600,
+		y: 1200
+	}, {
+		x: 1800,
+		y: 900
+	}, {
+		x: 1200,
+		y: 600
+	}, {
+		x: LEVEL_END_X,
+		y: LEVEL_END_Y
+	}];
+	for (var i = 0; i < platData.length; ++i) {
+		var p = new Platform();
+		p.x = platData[i].x;
+		p.y = platData[i].y;
+		platforms.push(p);
+		game.addChild(p);
+	}
+	// Enemies
+	var enemyData = [{
+		x: 800,
+		y: 1700
+	}, {
+		x: 1200,
+		y: 1400
+	}, {
+		x: 1600,
+		y: 1100
+	}];
+	for (var i = 0; i < enemyData.length; ++i) {
+		var e = new Enemy();
+		e.x = enemyData[i].x;
+		e.y = enemyData[i].y;
+		enemies.push(e);
+		game.addChild(e);
+	}
+	// Collectibles
+	var starData = [{
+		x: 400,
+		y: 2100
+	}, {
+		x: 1200,
+		y: 1400
+	}, {
+		x: 1800,
+		y: 800
+	}];
+	for (var i = 0; i < starData.length; ++i) {
+		var c = new Collectible();
+		c.x = starData[i].x;
+		c.y = starData[i].y;
+		collectibles.push(c);
+		game.addChild(c);
+	}
+	// Rocket
+	rocket = new Rocket();
+	rocket.x = LEVEL_END_X;
+	rocket.y = LEVEL_END_Y - 100;
+	game.addChild(rocket);
+	// Player
+	player = new Player();
+	player.x = 400;
+	player.y = 2100;
+	game.addChild(player);
+	// Reset UI
+	updateScore();
+	updateLives();
+	lastGameOver = false;
+	lastYouWin = false;
+}
+setupLevel();
+// --- UI Update --- 
+function updateScore() {
+	scoreTxt.setText('Score: ' + score);
+}
+function updateLives() {
+	livesTxt.setText('Lives: ' + lives);
+}
+// --- Lose Life --- 
+function loseLife() {
+	if (lastGameOver) return;
+	lives -= 1;
+	updateLives();
+	if (lives <= 0) {
+		LK.showGameOver();
+		lastGameOver = true;
+	} else {
+		// Respawn player
+		player.x = 400;
+		player.y = 2100;
+		player.vx = 0;
+		player.vy = 0;
+	}
+}
+// --- GAME CONTROLS (Touch/Drag) --- 
+game.down = function (x, y, obj) {
+	// Start drag if touch on player
+	if (player && Math.abs(x - player.x) < player.width / 2 && Math.abs(y - player.y) < player.height / 2) {
+		dragNode = player;
+	}
+};
+game.up = function (x, y, obj) {
+	dragNode = null;
+};
+game.move = function (x, y, obj) {
+	if (dragNode === player) {
+		// Move player horizontally only
+		player.x = x;
+	}
+};
+// --- GAME LOOP --- 
+game.update = function () {
+	// Player update
+	if (player) player.update();
+	// Enemies update
+	for (var i = 0; i < enemies.length; ++i) {
+		enemies[i].update();
+	}
+	// Win/Lose handled in player.update
+};
\ No newline at end of file