var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.createAsset('hero', 'Hero character', .5, .5);
	self.speed = 20;
	self.jump = function () {};
	self.shoot = function () {};
	self.moveLeft = function () {
		self.x -= self.speed;
	};
	self.moveRight = function () {
		self.x += self.speed;
	};
	self.healthBar = self.createAsset('highQualityHealthBar', 'High Quality Health Bar', 0, 0);
	self.healthBar.width = 200;
	self.healthBar.height = 20;
	self.healthBar.x = 0;
	self.healthBar.y = -self.height / 2 - self.healthBar.height / 2;
	self.health = 100;
	self.update = function (mouseX) {
		if (self.x < mouseX) {
			self.moveRight();
		} else if (self.x > mouseX) {
			self.moveLeft();
		}
	};
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.createAsset('enemy', 'Enemy character', .5, .5);
	self.speed = 3;
	self.health = 100;
	self.move = function (targetX, targetY) {
		if (self.x < targetX) {
			self.x += self.speed;
		} else if (self.x > targetX) {
			self.x -= self.speed;
		}
		if (self.y < targetY) {
			self.y += self.speed;
		} else if (self.y > targetY) {
			self.y -= self.speed;
		}
	};
	self.attack = function () {};
});
var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('heroBullet', 'Hero Bullet', .5, .5);
	self.speed = 10;
	self.target = null;
	LK.setTimeout(function () {
		self.destroy();
	}, 5000);
	self.move = function () {
		if (self.target) {
			var dx = self.target.x - self.x;
			var dy = self.target.y - self.y;
			var angle = Math.atan2(dy, dx);
			self.x += Math.cos(angle) * self.speed;
			self.y += Math.sin(angle) * self.speed;
			bulletGraphics.rotation = angle;
		} else {
			self.x += self.speed;
		}
	};
});
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('enemyBullet', 'Enemy Bullet', .5, .5);
	self.speed = 7;
	self.move = function () {};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var background = self.createAsset('epicBackground', 'Epic Background', 0, 0);
	background.width = 2048;
	background.height = 2732;
	self.on('move', function (obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		hero.x = pos.x;
		hero.y = pos.y;
	});
	var bulletSpawnInterval = LK.setInterval(function () {
		var nearestEnemy = enemies.length > 0 ? enemies.reduce((prev, curr) => {
			var d1 = Math.hypot(hero.x - prev.x, hero.y - prev.y);
			var d2 = Math.hypot(hero.x - curr.x, hero.y - curr.y);
			return d1 < d2 ? prev : curr;
		}) : null;
		var bullet = new HeroBullet();
		bullet.x = hero.x;
		bullet.y = hero.y;
		bullet.target = nearestEnemy;
		heroBullets.push(bullet);
		self.addChild(bullet);
	}, 1000);
	var hero = self.addChild(new Hero());
	var enemies = [];
	var enemySpawnInterval = LK.setInterval(function () {
		for (var i = 0; i < 5; i++) {
			var enemy = new Enemy();
			enemy.x = Math.random() * 2048;
			enemy.y = Math.random() * 2732;
			enemies.push(enemy);
			self.addChild(enemy);
		}
	}, 10000);
	var heroBullets = [];
	var enemyBullets = [];
	hero.x = 724;
	hero.y = 1366;
	LK.on('tick', function () {
		hero.update();
		for (var i = 0; i < enemies.length; i++) {
			enemies[i].move(hero.x, hero.y);
			if (enemies[i].intersects(hero)) {
				LK.setTimeout(function () {
					hero.health -= 10;
					hero.healthBar.width = hero.health;
					if (hero.health <= 0) {
						LK.showGameOver();
					}
				}, 1000);
			}
			for (var j = 0; j < heroBullets.length; j++) {
				if (enemies[i] && heroBullets[j] && enemies[i].intersects(heroBullets[j])) {
					enemies[i].health -= 10;
					heroBullets[j].destroy();
					if (enemies[i].health <= 0) {
						enemies[i].destroy();
						enemies.splice(i, 1);
					} else {
						enemies[i].tint = 0xFF0000 + 0x00FF00 * (enemies[i].health / 100);
					}
				}
			}
		}
		for (var i = 0; i < heroBullets.length; i++) {
			heroBullets[i].move();
		}
		for (var i = 0; i < enemyBullets.length; i++) {
			enemyBullets[i].update();
		}
	});
	LK.on('keydown', function (event) {
		switch (event.key) {
			case 'ArrowLeft':
				hero.moveLeft();
				break;
			case 'ArrowRight':
				hero.moveRight();
				break;
			case 'Space':
				hero.jump();
				break;
			case 'Control':
				hero.shoot();
				break;
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -9,9 +9,8 @@
 	};
 	self.moveRight = function () {
 		self.x += self.speed;
 	};
-	self.healthBar = self.createAsset('healthBar', 'Hero Health Bar', 0, 0);
 	self.healthBar = self.createAsset('highQualityHealthBar', 'High Quality Health Bar', 0, 0);
 	self.healthBar.width = 200;
 	self.healthBar.height = 20;
 	self.healthBar.x = 0;
@@ -97,13 +96,15 @@
 	}, 1000);
 	var hero = self.addChild(new Hero());
 	var enemies = [];
 	var enemySpawnInterval = LK.setInterval(function () {
-		var enemy = new Enemy();
-		enemy.x = Math.random() * 2048;
-		enemy.y = Math.random() * 2732;
-		enemies.push(enemy);
-		self.addChild(enemy);
+		for (var i = 0; i < 5; i++) {
+			var enemy = new Enemy();
+			enemy.x = Math.random() * 2048;
+			enemy.y = Math.random() * 2732;
+			enemies.push(enemy);
+			self.addChild(enemy);
+		}
 	}, 10000);
 	var heroBullets = [];
 	var enemyBullets = [];
 	hero.x = 724;