/**** 
* 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 = 15;
	self.damage = 25;
	self.targetX = 0;
	self.targetY = 0;
	self.directionX = 0;
	self.directionY = 0;
	self.setTarget = function (x, y) {
		self.targetX = x;
		self.targetY = y;
		var dx = x - self.x;
		var dy = y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		self.directionX = dx / distance;
		self.directionY = dy / distance;
	};
	self.update = function () {
		self.x += self.directionX * self.speed;
		self.y += self.directionY * self.speed;
	};
	return self;
});
var Cover = Container.expand(function () {
	var self = Container.call(this);
	var coverGraphics = self.attachAsset('cover', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	return self;
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 20;
	self.speed = 2;
	self.damage = 15;
	self.lastAttack = 0;
	self.attackCooldown = 120; // 2 seconds at 60fps
	self.targetX = Math.random() * 2048;
	self.targetY = Math.random() * 2732;
	self.changeTargetTime = LK.ticks + Math.random() * 180; // Change direction every 1-3 seconds
	self.takeDamage = function (damage) {
		self.health -= damage;
		if (self.health <= 0) {
			return true; // enemy died
		}
		return false;
	};
	self.update = function () {
		// Change movement target periodically
		if (LK.ticks > self.changeTargetTime) {
			self.targetX = Math.random() * 2048;
			self.targetY = Math.random() * 2732;
			self.changeTargetTime = LK.ticks + Math.random() * 180;
		}
		// Move towards target
		var dx = self.targetX - self.x;
		var dy = self.targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 10) {
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
		}
		// Attack player if close enough
		var playerDistance = Math.sqrt((player.x - self.x) * (player.x - self.x) + (player.y - self.y) * (player.y - self.y));
		if (playerDistance < 200 && LK.ticks - self.lastAttack > self.attackCooldown) {
			self.lastAttack = LK.ticks;
			var playerDied = player.takeDamage(self.damage);
			if (playerDied) {
				gameOver = true;
			}
			LK.getSound('playerHit').play();
			LK.effects.flashObject(player, 0xff0000, 500);
		}
	};
	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.ammo = 30;
	self.maxAmmo = 30;
	self.lastShot = 0;
	self.shootCooldown = 200; // milliseconds
	self.ammoRegenTime = 0;
	self.ammoRegenDelay = 2000; // 2 seconds
	self.takeDamage = function (damage) {
		self.health -= damage;
		if (self.health <= 0) {
			self.health = 0;
			return true; // player died
		}
		return false;
	};
	self.canShoot = function () {
		return self.ammo > 0 && LK.ticks - self.lastShot > self.shootCooldown / 16.67;
	};
	self.shoot = function () {
		if (self.canShoot()) {
			self.ammo--;
			self.lastShot = LK.ticks;
			self.ammoRegenTime = LK.ticks + self.ammoRegenDelay / 16.67;
			return true;
		}
		return false;
	};
	self.update = function () {
		// Regenerate ammo after delay
		if (self.ammo < self.maxAmmo && LK.ticks > self.ammoRegenTime) {
			if (LK.ticks % 30 === 0) {
				// Regenerate every half second
				self.ammo++;
			}
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2d4a2b
});

/**** 
* Game Code
****/ 
var player;
var enemies = [];
var bullets = [];
var covers = [];
var dragNode = null;
var gameOver = false;
var currentWave = 1;
var enemiesKilled = 0;
var waveEnemiesCount = 3;
var waveInProgress = false;
// UI Elements
var healthBarBg = LK.getAsset('healthBar', {
	x: 100,
	y: 100,
	scaleX: 1,
	scaleY: 1,
	alpha: 0.3
});
var healthBarFill = LK.getAsset('healthBar', {
	x: 100,
	y: 100,
	scaleX: 1,
	scaleY: 1
});
var ammoBarBg = LK.getAsset('ammoBar', {
	x: 100,
	y: 150,
	scaleX: 1,
	scaleY: 1,
	alpha: 0.3
});
var ammoBarFill = LK.getAsset('ammoBar', {
	x: 100,
	y: 150,
	scaleX: 1,
	scaleY: 1
});
game.addChild(healthBarBg);
game.addChild(healthBarFill);
game.addChild(ammoBarBg);
game.addChild(ammoBarFill);
var waveText = new Text2('Wave: 1', {
	size: 80,
	fill: 0xFFFFFF
});
waveText.anchor.set(0.5, 0);
LK.gui.top.addChild(waveText);
var scoreText = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreText.anchor.set(1, 0);
LK.gui.topRight.addChild(scoreText);
// Initialize player
player = game.addChild(new Player());
player.x = 1024;
player.y = 2000;
// Create cover objects
for (var i = 0; i < 8; i++) {
	var cover = game.addChild(new Cover());
	cover.x = 200 + i % 4 * 450;
	cover.y = 800 + Math.floor(i / 4) * 600 + Math.random() * 200;
	covers.push(cover);
}
function spawnWave() {
	waveInProgress = true;
	var enemiesToSpawn = waveEnemiesCount + (currentWave - 1);
	for (var i = 0; i < enemiesToSpawn; i++) {
		var enemy = game.addChild(new Enemy());
		enemy.x = Math.random() * 2048;
		enemy.y = Math.random() * 800; // Spawn in upper part of screen
		enemy.health += (currentWave - 1) * 5; // Increase health each wave
		enemy.speed += (currentWave - 1) * 0.5; // Increase speed each wave
		enemies.push(enemy);
	}
	waveText.setText('Wave: ' + currentWave);
}
function updateUI() {
	// Update health bar
	var healthPercent = player.health / player.maxHealth;
	healthBarFill.scaleX = healthPercent;
	// Update ammo bar
	var ammoPercent = player.ammo / player.maxAmmo;
	ammoBarFill.scaleX = ammoPercent;
	// Update score
	scoreText.setText('Score: ' + LK.getScore());
}
function handleMove(x, y, obj) {
	if (dragNode && !gameOver) {
		dragNode.x = x;
		dragNode.y = y;
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	if (gameOver) return;
	// Check if clicking on player for dragging
	var playerDistance = Math.sqrt((player.x - x) * (player.x - x) + (player.y - y) * (player.y - y));
	if (playerDistance < 50) {
		dragNode = player;
		handleMove(x, y, obj);
	} else {
		// Shoot at clicked location
		if (player.shoot()) {
			var bullet = game.addChild(new Bullet());
			bullet.x = player.x;
			bullet.y = player.y;
			bullet.setTarget(x, y);
			bullets.push(bullet);
			LK.getSound('shoot').play();
		}
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Start first wave
spawnWave();
game.update = function () {
	if (gameOver) return;
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		// Check if bullet is off screen
		if (bullet.x < -50 || bullet.x > 2098 || bullet.y < -50 || bullet.y > 2782) {
			bullet.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check bullet-enemy collisions
		var bulletHit = false;
		for (var j = enemies.length - 1; j >= 0; j--) {
			var enemy = enemies[j];
			if (bullet.intersects(enemy)) {
				var enemyDied = enemy.takeDamage(bullet.damage);
				if (enemyDied) {
					LK.setScore(LK.getScore() + 10);
					enemiesKilled++;
					LK.effects.flashObject(enemy, 0xffffff, 300);
					enemy.destroy();
					enemies.splice(j, 1);
				}
				LK.getSound('enemyHit').play();
				bullet.destroy();
				bullets.splice(i, 1);
				bulletHit = true;
				break;
			}
		}
		if (bulletHit) continue;
		// Check bullet-cover collisions
		for (var k = covers.length - 1; k >= 0; k--) {
			var cover = covers[k];
			if (bullet.intersects(cover)) {
				bullet.destroy();
				bullets.splice(i, 1);
				bulletHit = true;
				break;
			}
		}
		if (bulletHit) continue;
	}
	// Check if wave is complete
	if (waveInProgress && enemies.length === 0) {
		waveInProgress = false;
		currentWave++;
		// Restore some health and ammo between waves
		player.health = Math.min(player.maxHealth, player.health + 20);
		player.ammo = Math.min(player.maxAmmo, player.ammo + 10);
		// Start next wave after delay
		LK.setTimeout(function () {
			if (!gameOver) {
				spawnWave();
			}
		}, 2000);
	}
	// Check for game over conditions
	if (player.health <= 0) {
		gameOver = true;
		LK.showGameOver();
	}
	// Check for win condition (survive 10 waves)
	if (currentWave > 10 && enemies.length === 0) {
		LK.showYouWin();
	}
	updateUI();
};

===================================================================
--- original.js
+++ change.js
@@ -204,12 +204,12 @@
 player = game.addChild(new Player());
 player.x = 1024;
 player.y = 2000;
 // Create cover objects
-for (var i = 0; i < 4; i++) {
+for (var i = 0; i < 8; i++) {
 	var cover = game.addChild(new Cover());
-	cover.x = 300 + i * 400;
-	cover.y = 1200 + Math.random() * 400;
+	cover.x = 200 + i % 4 * 450;
+	cover.y = 800 + Math.floor(i / 4) * 600 + Math.random() * 200;
 	covers.push(cover);
 }
 function spawnWave() {
 	waveInProgress = true;
@@ -296,8 +296,19 @@
 				break;
 			}
 		}
 		if (bulletHit) continue;
+		// Check bullet-cover collisions
+		for (var k = covers.length - 1; k >= 0; k--) {
+			var cover = covers[k];
+			if (bullet.intersects(cover)) {
+				bullet.destroy();
+				bullets.splice(i, 1);
+				bulletHit = true;
+				break;
+			}
+		}
+		if (bulletHit) continue;
 	}
 	// Check if wave is complete
 	if (waveInProgress && enemies.length === 0) {
 		waveInProgress = false;