/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	// Attach bullet asset (yellow box)
	var bulletSprite = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 32;
	self.damage = 1;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
// LootBox class
var LootBox = Container.expand(function () {
	var self = Container.call(this);
	// Attach lootbox asset (orange ellipse)
	var lootSprite = self.attachAsset('lootbox', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.type = 'ammo'; // 'ammo', 'medkit', 'money'
	self.value = 1;
	self.speed = 2.5;
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});
// Player class (stationary)
var Player = Container.expand(function () {
	var self = Container.call(this);
	// Attach player asset (red box)
	var playerSprite = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Gun barrel position (relative to player)
	self.getGunPos = function () {
		// Gun at right edge, center vertically
		return {
			x: self.x + playerSprite.width / 2,
			y: self.y
		};
	};
	return self;
});
// Zombie class
var Zombie = Container.expand(function () {
	var self = Container.call(this);
	// Attach zombie asset (box, greenish)
	var zombieSprite = self.attachAsset('zombie', {
		anchorX: 0.5,
		anchorY: 1
	});
	// Set up stats
	self.maxHealth = 1;
	self.health = 1;
	self.speed = 2;
	self.reward = 10; // money for killing
	// Health bar
	var healthBar = self.addChild(LK.getAsset('zombieHealthBar', {
		anchorX: 0.5,
		anchorY: 0.5,
		width: 60,
		height: 10,
		color: 0xff0000
	}));
	healthBar.y = -zombieSprite.height + 10;
	// Update health bar
	self.updateHealthBar = function () {
		healthBar.width = 60 * (self.health / self.maxHealth);
	};
	// Called every tick
	self.update = function () {
		self.x -= self.speed;
		// Health bar follows
		self.updateHealthBar();
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222222
});

/**** 
* Game Code
****/ 
// --- Game State ---
// --- Asset Initialization ---
var player = null;
var bullets = [];
var zombies = [];
var lootboxes = [];
var money = 0;
var ammo = 10;
var maxAmmo = 10;
var health = 5;
var maxHealth = 5;
var level = 1;
var zombiesToSpawn = 0;
var zombiesSpawned = 0;
var zombiesKilled = 0;
var spawnTimer = 0;
var reloadTimer = 0;
var isReloading = false;
var weaponIndex = 0;
var weapons = [{
	name: "Pistol",
	damage: 1,
	ammo: 10,
	reload: 60,
	bulletSpeed: 32,
	color: 0xf7e12b
}, {
	name: "SMG",
	damage: 1,
	ammo: 20,
	reload: 40,
	bulletSpeed: 36,
	color: 0x00bfff
}, {
	name: "Shotgun",
	damage: 3,
	ammo: 5,
	reload: 90,
	bulletSpeed: 28,
	color: 0xffffff
}];
var unlockedWeapons = 1; // Start with 1 weapon
// --- UI Elements ---
var scoreTxt = new Text2('Score: 0', {
	size: 80,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var moneyTxt = new Text2('$0', {
	size: 60,
	fill: 0xFFE066
});
moneyTxt.anchor.set(0, 0);
LK.gui.topRight.addChild(moneyTxt);
var ammoTxt = new Text2('Ammo: 10/10', {
	size: 60,
	fill: "#fff"
});
ammoTxt.anchor.set(0, 0);
LK.gui.bottomLeft.addChild(ammoTxt);
var healthTxt = new Text2('♥♥♥♥♥', {
	size: 60,
	fill: 0xFF4D4D
});
healthTxt.anchor.set(0, 1);
LK.gui.bottom.addChild(healthTxt);
var weaponTxt = new Text2('Pistol', {
	size: 60,
	fill: "#fff"
});
weaponTxt.anchor.set(0.5, 0);
LK.gui.bottom.addChild(weaponTxt);
// --- Helper Functions ---
function updateUI() {
	scoreTxt.setText('Score: ' + zombiesKilled);
	moneyTxt.setText('$' + money);
	ammoTxt.setText('Ammo: ' + ammo + '/' + maxAmmo);
	var hearts = '';
	for (var i = 0; i < health; i++) hearts += '♥';
	for (var i = health; i < maxHealth; i++) hearts += '♡';
	healthTxt.setText(hearts);
	weaponTxt.setText(weapons[weaponIndex].name);
}
function startLevel(lvl) {
	level = lvl;
	zombiesToSpawn = 5 + Math.floor(level * 1.5);
	zombiesSpawned = 0;
	spawnTimer = 0;
	zombiesKilled = 0;
	// Unlock new weapon every 5 levels
	if (level % 5 === 0 && unlockedWeapons < weapons.length) {
		unlockedWeapons++;
	}
	// Increase difficulty
	// (handled in spawnZombie)
}
function spawnZombie() {
	var z = new Zombie();
	// Position at right edge, random y
	z.x = 2048 + 80;
	z.y = 400 + Math.floor(Math.random() * (2732 - 800));
	// Scale health and speed with level
	z.maxHealth = 2 + Math.floor(level * 0.7);
	z.health = z.maxHealth;
	z.speed = 2 + Math.random() * 0.5 + level * 0.1;
	z.reward = 10 + level * 2;
	zombies.push(z);
	game.addChild(z);
	zombiesSpawned++;
}
function spawnLootBox(x, y) {
	var loot = new LootBox();
	loot.x = x;
	loot.y = y;
	// Randomize type
	var r = Math.random();
	if (r < 0.4) {
		loot.type = 'ammo';
		loot.value = 5 + Math.floor(Math.random() * 5);
	} else if (r < 0.7) {
		loot.type = 'medkit';
		loot.value = 1;
	} else {
		loot.type = 'money';
		loot.value = 20 + Math.floor(Math.random() * 20);
	}
	lootboxes.push(loot);
	game.addChild(loot);
}
// --- Game Setup ---
player = new Player();
player.x = 180;
player.y = 2732 / 2;
game.addChild(player);
// --- Input Handling ---
var lastShotTick = 0;
var dragNode = null;
// Mouse/touch move: aim gun
game.move = function (x, y, obj) {
	// No drag, just aiming
	// Optionally, could rotate gun sprite, but for now, just use for shooting
};
// Mouse/touch down: shoot
game.down = function (x, y, obj) {
	// Only shoot if not reloading
	if (isReloading) return;
	if (ammo <= 0) {
		// Start reload
		isReloading = true;
		reloadTimer = 0;
		return;
	}
	// Fire bullet
	var gunPos = player.getGunPos();
	var b = new Bullet();
	b.x = gunPos.x;
	b.y = gunPos.y;
	// Aim: calculate angle to (x, y)
	var dx = x - gunPos.x;
	var dy = y - gunPos.y;
	var dist = Math.sqrt(dx * dx + dy * dy);
	if (dist === 0) dist = 1;
	b.speed = weapons[weaponIndex].bulletSpeed;
	b.damage = weapons[weaponIndex].damage;
	// Set bullet direction
	b.vx = b.speed * (dx / dist);
	b.vy = b.speed * (dy / dist);
	// Overwrite update to use vx/vy
	b.update = function () {
		b.x += b.vx;
		b.y += b.vy;
	};
	bullets.push(b);
	game.addChild(b);
	ammo--;
	updateUI();
};
// Mouse/touch up: nothing
game.up = function (x, y, obj) {};
// --- Weapon Switching (tap weapon name to switch) ---
weaponTxt.down = function (x, y, obj) {
	weaponIndex = (weaponIndex + 1) % unlockedWeapons;
	// Update maxAmmo and ammo
	maxAmmo = weapons[weaponIndex].ammo;
	ammo = maxAmmo;
	updateUI();
};
// --- Main Game Loop ---
game.update = function () {
	// --- Spawning zombies ---
	if (zombiesSpawned < zombiesToSpawn) {
		spawnTimer++;
		if (spawnTimer > 60) {
			// spawn every 1s
			spawnZombie();
			spawnTimer = 0;
		}
	}
	// --- Bullets update ---
	for (var i = bullets.length - 1; i >= 0; i--) {
		var b = bullets[i];
		b.update();
		// Remove if off screen
		if (b.x > 2048 + 100 || b.y < -100 || b.y > 2732 + 100) {
			b.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check collision with zombies
		for (var j = zombies.length - 1; j >= 0; j--) {
			var z = zombies[j];
			if (b.intersects(z)) {
				z.health -= b.damage;
				if (z.health <= 0) {
					// Zombie dies
					money += z.reward;
					zombiesKilled++;
					spawnLootBox(z.x, z.y - 40);
					z.destroy();
					zombies.splice(j, 1);
				}
				b.destroy();
				bullets.splice(i, 1);
				break;
			}
		}
	}
	// --- Zombies update ---
	for (var i = zombies.length - 1; i >= 0; i--) {
		var z = zombies[i];
		z.update();
		// If zombie reaches player
		if (z.x < player.x + 60) {
			// Damage player
			health--;
			LK.effects.flashObject(player, 0xff0000, 400);
			z.destroy();
			zombies.splice(i, 1);
			if (health <= 0) {
				LK.effects.flashScreen(0xff0000, 1000);
				LK.showGameOver();
				return;
			}
		}
	}
	// --- Lootboxes update ---
	for (var i = lootboxes.length - 1; i >= 0; i--) {
		var l = lootboxes[i];
		l.update();
		// If off screen
		if (l.x < -100) {
			l.destroy();
			lootboxes.splice(i, 1);
			continue;
		}
		// If player collects
		if (l.intersects(player)) {
			if (l.type === 'ammo') {
				ammo += l.value;
				if (ammo > maxAmmo) ammo = maxAmmo;
			} else if (l.type === 'medkit') {
				health += l.value;
				if (health > maxHealth) health = maxHealth;
			} else if (l.type === 'money') {
				money += l.value;
			}
			l.destroy();
			lootboxes.splice(i, 1);
		}
	}
	// --- Reloading ---
	if (isReloading) {
		reloadTimer++;
		if (reloadTimer > weapons[weaponIndex].reload) {
			isReloading = false;
			ammo = maxAmmo;
			updateUI();
		}
	}
	// --- Level progression ---
	if (zombiesSpawned === zombiesToSpawn && zombies.length === 0) {
		// Next level
		startLevel(level + 1);
	}
	updateUI();
};
// --- Start Game ---
money = 0;
ammo = weapons[weaponIndex].ammo;
maxAmmo = weapons[weaponIndex].ammo;
health = maxHealth;
zombiesKilled = 0;
unlockedWeapons = 1;
weaponIndex = 0;
startLevel(1);
updateUI();

===================================================================
--- original.js
+++ change.js