===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,294 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+var Bullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('bullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 8;
+	self.directionX = 1;
+	self.directionY = 0;
+	self.lifespan = 120;
+	self.update = function () {
+		self.x += self.directionX * self.speed;
+		self.y += self.directionY * self.speed;
+		self.lifespan--;
+		if (self.lifespan <= 0) {
+			self.shouldDestroy = true;
+		}
+		if (self.x < -50 || self.x > 2098 || self.y < -50 || self.y > 2782) {
+			self.shouldDestroy = true;
+		}
+	};
+	return self;
+});
+var HealthPack = Container.expand(function () {
+	var self = Container.call(this);
+	var healthGraphics = self.attachAsset('healthPack', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.healAmount = 30;
+	self.collected = false;
+	self.update = function () {
+		if (!self.collected && self.intersects(player)) {
+			player.heal(self.healAmount);
+			LK.getSound('pickup').play();
+			self.collected = true;
+			self.shouldDestroy = true;
+		}
+	};
+	return self;
+});
+var Player = Container.expand(function () {
+	var self = Container.call(this);
+	var playerGraphics = self.attachAsset('player', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.health = 100;
+	self.maxHealth = 100;
+	self.shootCooldown = 0;
+	self.lastMoveX = 1;
+	self.lastMoveY = 0;
+	self.takeDamage = function (damage) {
+		self.health -= damage;
+		if (self.health <= 0) {
+			self.health = 0;
+		}
+		LK.effects.flashObject(self, 0xFF0000, 300);
+	};
+	self.heal = function (amount) {
+		self.health = Math.min(self.maxHealth, self.health + amount);
+	};
+	self.update = function () {
+		if (self.shootCooldown > 0) {
+			self.shootCooldown--;
+		}
+	};
+	return self;
+});
+var Zombie = Container.expand(function () {
+	var self = Container.call(this);
+	var zombieGraphics = self.attachAsset('zombie', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 1;
+	self.health = 1;
+	self.damage = 10;
+	self.lastPlayerCollision = false;
+	self.update = function () {
+		var dx = player.x - self.x;
+		var dy = player.y - self.y;
+		var distance = Math.sqrt(dx * dx + dy * dy);
+		if (distance > 0) {
+			self.x += dx / distance * self.speed;
+			self.y += dy / distance * self.speed;
+		}
+		var currentCollision = self.intersects(player);
+		if (!self.lastPlayerCollision && currentCollision) {
+			player.takeDamage(self.damage);
+		}
+		self.lastPlayerCollision = currentCollision;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x2C5530
+});
+
+/**** 
+* Game Code
+****/ 
+var player;
+var zombies = [];
+var bullets = [];
+var healthPacks = [];
+var waveNumber = 1;
+var zombieSpawnRate = 120;
+var healthPackSpawnRate = 1800;
+var lastHealthPackSpawn = 0;
+var dragActive = false;
+// UI Elements
+var scoreText = new Text2('Score: 0', {
+	size: 60,
+	fill: 0xFFFFFF
+});
+scoreText.anchor.set(0, 0);
+scoreText.x = 120;
+scoreText.y = 50;
+LK.gui.topLeft.addChild(scoreText);
+var healthText = new Text2('Health: 100', {
+	size: 60,
+	fill: 0xFF0000
+});
+healthText.anchor.set(1, 0);
+LK.gui.topRight.addChild(healthText);
+var waveText = new Text2('Wave: 1', {
+	size: 50,
+	fill: 0xFFFF00
+});
+waveText.anchor.set(0.5, 0);
+LK.gui.top.addChild(waveText);
+// Initialize player
+player = game.addChild(new Player());
+player.x = 1024;
+player.y = 1366;
+function spawnZombie() {
+	var zombie = new Zombie();
+	var side = Math.floor(Math.random() * 4);
+	switch (side) {
+		case 0:
+			// Top
+			zombie.x = Math.random() * 2048;
+			zombie.y = -30;
+			break;
+		case 1:
+			// Right
+			zombie.x = 2078;
+			zombie.y = Math.random() * 2732;
+			break;
+		case 2:
+			// Bottom
+			zombie.x = Math.random() * 2048;
+			zombie.y = 2762;
+			break;
+		case 3:
+			// Left
+			zombie.x = -30;
+			zombie.y = Math.random() * 2732;
+			break;
+	}
+	zombie.speed = 0.8 + waveNumber * 0.1;
+	zombies.push(zombie);
+	game.addChild(zombie);
+}
+function spawnHealthPack() {
+	var healthPack = new HealthPack();
+	healthPack.x = 200 + Math.random() * 1648;
+	healthPack.y = 200 + Math.random() * 2332;
+	healthPacks.push(healthPack);
+	game.addChild(healthPack);
+}
+function shootBullet() {
+	if (player.shootCooldown <= 0) {
+		var bullet = new Bullet();
+		bullet.x = player.x;
+		bullet.y = player.y;
+		bullet.directionX = player.lastMoveX;
+		bullet.directionY = player.lastMoveY;
+		bullets.push(bullet);
+		game.addChild(bullet);
+		player.shootCooldown = 15;
+		LK.getSound('shoot').play();
+	}
+}
+game.down = function (x, y, obj) {
+	dragActive = true;
+	player.x = x;
+	player.y = y;
+	var dx = x - player.x;
+	var dy = y - player.y;
+	var distance = Math.sqrt(dx * dx + dy * dy);
+	if (distance > 0) {
+		player.lastMoveX = dx / distance;
+		player.lastMoveY = dy / distance;
+	}
+	shootBullet();
+};
+game.move = function (x, y, obj) {
+	if (dragActive) {
+		var dx = x - player.x;
+		var dy = y - player.y;
+		var distance = Math.sqrt(dx * dx + dy * dy);
+		if (distance > 5) {
+			player.x = x;
+			player.y = y;
+			if (distance > 0) {
+				player.lastMoveX = dx / distance;
+				player.lastMoveY = dy / distance;
+			}
+		}
+	}
+};
+game.up = function (x, y, obj) {
+	dragActive = false;
+};
+game.update = function () {
+	// Check for game over
+	if (player.health <= 0) {
+		LK.showGameOver();
+		return;
+	}
+	// Update UI
+	scoreText.setText('Score: ' + LK.getScore());
+	healthText.setText('Health: ' + player.health);
+	waveText.setText('Wave: ' + waveNumber);
+	// Spawn zombies
+	if (LK.ticks % zombieSpawnRate === 0) {
+		spawnZombie();
+	}
+	// Increase difficulty over time
+	if (LK.ticks % 1800 === 0) {
+		waveNumber++;
+		if (zombieSpawnRate > 30) {
+			zombieSpawnRate -= 5;
+		}
+	}
+	// Spawn health packs
+	if (LK.ticks - lastHealthPackSpawn > healthPackSpawnRate && Math.random() < 0.1) {
+		spawnHealthPack();
+		lastHealthPackSpawn = LK.ticks;
+	}
+	// Auto shoot
+	if (LK.ticks % 20 === 0) {
+		shootBullet();
+	}
+	// Keep player in bounds
+	player.x = Math.max(40, Math.min(2008, player.x));
+	player.y = Math.max(40, Math.min(2692, player.y));
+	// Update bullets
+	for (var i = bullets.length - 1; i >= 0; i--) {
+		var bullet = bullets[i];
+		if (bullet.shouldDestroy) {
+			bullet.destroy();
+			bullets.splice(i, 1);
+			continue;
+		}
+		// Check bullet-zombie collisions
+		for (var j = zombies.length - 1; j >= 0; j--) {
+			var zombie = zombies[j];
+			if (bullet.intersects(zombie)) {
+				zombie.health--;
+				if (zombie.health <= 0) {
+					LK.setScore(LK.getScore() + 10);
+					LK.getSound('zombieHit').play();
+					zombie.destroy();
+					zombies.splice(j, 1);
+				}
+				bullet.shouldDestroy = true;
+				break;
+			}
+		}
+	}
+	// Update health packs
+	for (var i = healthPacks.length - 1; i >= 0; i--) {
+		var healthPack = healthPacks[i];
+		if (healthPack.shouldDestroy) {
+			healthPack.destroy();
+			healthPacks.splice(i, 1);
+		}
+	}
+};
\ No newline at end of file