/**** 
* Classes
****/ 
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 20;
	self._move_migrated = function () {
		self.x += self.speed * Math.cos(self.angle);
		self.y += self.speed * Math.sin(self.angle);
		self.rotation += 0.1;
	};
});
var Enemy = Container.expand(function (hero) {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self._move_migrated = function () {
		var dx = hero.x - self.x;
		var dy = hero.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		self.x += dx / distance * 1.8;
		self.y += dy / distance * 1.8;
	};
});
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self._move_migrated = function () {
		if (self.targetPos) {
			var dx = self.targetPos.x - self.x;
			var dy = self.targetPos.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 5) {
				self.x += dx / distance * 10;
				self.y += dy / distance * 10;
			} else {
				self.x = self.targetPos.x;
				self.y = self.targetPos.y;
				self.targetPos = null;
			}
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
game.setBackgroundColor(0x008000);
var hero = game.addChild(new Hero());
hero.enemies = [];
var heroBullets = [];
var enemyBullets = [];
hero.x = 2048 / 2;
hero.y = 2732 / 2;
game.targetPos = null;
game.on('down', function (x, y, obj) {
	hero.targetPos = game.toLocal(obj.global);
});
var spawnEnemy = function spawnEnemy() {
	var side = Math.floor(Math.random() * 4);
	var enemy = new Enemy(hero);
	switch (side) {
		case 0:
			enemy.x = Math.random() * 2048;
			enemy.y = 0;
			break;
		case 1:
			enemy.x = 2048;
			enemy.y = Math.random() * 2732;
			break;
		case 2:
			enemy.x = Math.random() * 2048;
			enemy.y = 2732;
			break;
		case 3:
			enemy.x = 0;
			enemy.y = Math.random() * 2732;
			break;
	}
	hero.enemies.push(enemy);
	game.addChild(enemy);
};
LK.on('tick', function () {
	hero._move_migrated();
	for (var i = 0; i < heroBullets.length; i++) {
		heroBullets[i]._move_migrated();
	}
	for (var i = 0; i < enemyBullets.length; i++) {
		enemyBullets[i]._move_migrated();
	}
	for (var i = 0; i < hero.enemies.length; i++) {
		hero.enemies[i]._move_migrated();
		for (var j = 0; j < heroBullets.length; j++) {
			if (heroBullets[j].intersects(hero.enemies[i])) {
				heroBullets[j].destroy();
				heroBullets.splice(j, 1);
				hero.enemies[i].destroy();
				hero.enemies.splice(i, 1);
				i--;
				j--;
			}
		}
		if (hero.intersects(hero.enemies[i])) {
			LK.showGameOver();
		}
	}
	if (LK.ticks % 30 === 0) {
		spawnEnemy();
	}
	if (LK.ticks % 20 === 0 && hero.enemies.length > 0) {
		// Find the closest enemy
		var closestEnemy = null;
		var minDist = Infinity;
		for (var i = 0; i < hero.enemies.length; i++) {
			var dx = hero.enemies[i].x - hero.x;
			var dy = hero.enemies[i].y - hero.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist < minDist) {
				minDist = dist;
				closestEnemy = hero.enemies[i];
			}
		}
		if (closestEnemy) {
			var bullet = new Bullet();
			bullet.x = hero.x;
			bullet.y = hero.y;
			var dx = closestEnemy.x - hero.x;
			var dy = closestEnemy.y - hero.y;
			bullet.angle = Math.atan2(dy, dx);
			heroBullets.push(bullet);
			game.addChild(bullet);
		}
	}
});

===================================================================
--- original.js
+++ change.js
@@ -122,15 +122,29 @@
 	}
 	if (LK.ticks % 30 === 0) {
 		spawnEnemy();
 	}
-	if (LK.ticks % 20 === 0 && hero.targetPos) {
-		var bullet = new Bullet();
-		bullet.x = hero.x;
-		bullet.y = hero.y;
-		var dx = hero.targetPos.x - hero.x;
-		var dy = hero.targetPos.y - hero.y;
-		bullet.angle = Math.atan2(dy, dx);
-		heroBullets.push(bullet);
-		game.addChild(bullet);
+	if (LK.ticks % 20 === 0 && hero.enemies.length > 0) {
+		// Find the closest enemy
+		var closestEnemy = null;
+		var minDist = Infinity;
+		for (var i = 0; i < hero.enemies.length; i++) {
+			var dx = hero.enemies[i].x - hero.x;
+			var dy = hero.enemies[i].y - hero.y;
+			var dist = Math.sqrt(dx * dx + dy * dy);
+			if (dist < minDist) {
+				minDist = dist;
+				closestEnemy = hero.enemies[i];
+			}
+		}
+		if (closestEnemy) {
+			var bullet = new Bullet();
+			bullet.x = hero.x;
+			bullet.y = hero.y;
+			var dx = closestEnemy.x - hero.x;
+			var dy = closestEnemy.y - hero.y;
+			bullet.angle = Math.atan2(dy, dx);
+			heroBullets.push(bullet);
+			game.addChild(bullet);
+		}
 	}
 });
\ No newline at end of file