/**** 
* 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,
		tint: 0x2d4a2d
	});
	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: 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);
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -1,10 +1,5 @@
 /**** 
-* Plugins
-****/ 
-var tween = LK.import("@upit/tween.v1");
-
-/**** 
 * Classes
 ****/ 
 var Bullet = Container.expand(function () {
 	var self = Container.call(this);
@@ -78,9 +73,10 @@
 var Zombie = Container.expand(function () {
 	var self = Container.call(this);
 	var zombieGraphics = self.attachAsset('zombie', {
 		anchorX: 0.5,
-		anchorY: 0.5
+		anchorY: 0.5,
+		tint: 0x2d4a2d
 	});
 	self.speed = 1;
 	self.health = 1;
 	self.damage = 10;