var enemies = [];
var MiniMap = Container.expand(function () {
	var self = Container.call(this);
	var mapGraphics = self.createAsset('miniMap', 'Mini Map Graphics', 0, 0);
	self.updateMap = function (playerPosition, enemyPositions) {};
});
var WeaponIcon = Container.expand(function (iconAssetId) {
	var self = Container.call(this);
	var icon = self.createAsset(iconAssetId, 'Weapon Icon', 0.5, 0.5);
	self.changeWeapon = function (newIconAssetId) {
		self.removeChild(icon);
		icon = self.createAsset(newIconAssetId, 'Weapon Icon', 0.5, 0.5);
	};
});
var AmmoCounter = Container.expand(function () {
	var self = Container.call(this);
	var ammoText = new Text2('Ammo: 0', {
		size: 50,
		fill: '#ffffff'
	});
	self.addChild(ammoText);
	self.updateAmmo = function (ammo) {
		ammoText.setText('Ammo: ' + ammo);
	};
});
var HealthBar = Container.expand(function (maxHealth) {
	var self = Container.call(this);
	self.maxHealth = maxHealth;
	self.currentHealth = maxHealth;
	var background = self.createAsset('healthBarBg', 'Health Bar Background', 0, 0.5);
	var foreground = self.createAsset('healthBarFg', 'Health Bar Foreground', 0, 0.5);
	self.updateHealth = function (health) {
		self.currentHealth = health;
		foreground.scale.x = health / self.maxHealth;
		if (self.currentHealth < self.maxHealth * 0.3) {
			foreground.tint = 0xFF0000;
		} else if (self.currentHealth < self.maxHealth * 0.6) {
			foreground.tint = 0xFFFF00;
		} else {
			foreground.tint = 0x00FF00;
		}
	};
	self.reset = function () {
		self.updateHealth(self.maxHealth);
	};
});
var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('heroBullet', 'Hero Bullet Graphics', .5, .5);
	self.initialX = self.x;
	self.initialY = self.y;
	self.speed = -5;
	self.move = function () {
		var closestEnemy = null;
		var closestDistance = Number.MAX_VALUE;
		self.parent.children.forEach(function (obj) {
			if (obj instanceof Enemy) {
				var distance = Math.sqrt(Math.pow(self.x - obj.x, 2) + Math.pow(self.y - obj.y, 2));
				if (distance < closestDistance) {
					closestDistance = distance;
					closestEnemy = obj;
				}
			}
		});
		if (closestEnemy) {
			self.angle = Math.atan2(closestEnemy.y - self.y, closestEnemy.x - self.x);
			self.x += self.speed * Math.cos(self.angle);
			self.y += self.speed * Math.sin(self.angle);
		} else {
			self.destroy();
			heroBullets.splice(heroBullets.indexOf(self), 1);
		}
		var allObjects = self.parent.children;
		for (var i = 0; i < allObjects.length; i++) {
			var obj = allObjects[i];
			if (obj !== self && !(obj instanceof HeroBullet) && !(obj instanceof EnemyBullet) && self.intersects(obj)) {
				if (obj instanceof Enemy) {
					obj.takeDamage();
					obj.x -= 50 * Math.cos(obj.angle);
					obj.y -= 50 * Math.sin(obj.angle);
				}
				self.destroy();
				heroBullets.splice(heroBullets.indexOf(self), 1);
				break;
			}
		}
	};
});
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('enemyBullet', 'Enemy Bullet Graphics', .5, .5);
	self.speed = 5;
	self.move = function () {
		self.y += self.speed;
	};
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	self.takeDamage = function () {
		self.health -= 1;
		if (self.health <= 0) {
			enemies.splice(enemies.indexOf(self), 1);
			self.destroy();
		}
	};
	self.health = 3;
	self.shootCooldown = 180 / 60 * 3;
	var enemyGraphics = self.createAsset('stormTrooper', 'Stormtrooper Graphics', .5, .5);
	self.speed = 2;
	self.move = function () {
		self.x += self.speed * Math.cos(self.angle);
		self.y += self.speed * Math.sin(self.angle);
	};
	self.shoot = function (enemyBullets, gameContainer, hero) {
		if (!self.bullet && self.shootCooldown <= 0) {
			var bullet = new EnemyBullet();
			bullet.x = self.x;
			bullet.y = self.y + self.height / 2;
			bullet.angle = Math.atan2(hero.y - bullet.y, hero.x - bullet.x);
			bullet.move = function () {
				bullet.x += bullet.speed * Math.cos(bullet.angle);
				bullet.y += bullet.speed * Math.sin(bullet.angle);
			};
			enemyBullets.push(bullet);
			this.parent.addChild(bullet);
			self.bullet = bullet;
			self.shootCooldown = 180 / 60 * 3;
		}
	};
});
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.createAsset('hero', 'Hero Graphics', .5, .5);
	self.shootCooldown = 0;
	self.targetX = self.x;
	self.targetY = self.y;
	self.moveSpeed = 6.75;
	self.updatePosition = function () {
		if (self.x !== self.targetX || self.y !== self.targetY) {
			var deltaX = self.targetX - self.x;
			var deltaY = self.targetY - self.y;
			var distance = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
			if (distance < self.moveSpeed) {
				self.x = self.targetX;
				self.y = self.targetY;
			} else {
				self.x += deltaX / distance * self.moveSpeed;
				self.y += deltaY / distance * self.moveSpeed;
			}
		}
	};
	self.shoot = function (heroBullets, gameContainer, allObjects) {
		if (self.shootCooldown <= 0) {
			var bullet = new HeroBullet();
			bullet.x = self.x;
			bullet.y = self.y - self.height / 2;
			bullet.angle = 0;
			bullet.move = function () {
				bullet.x += bullet.speed * Math.cos(bullet.angle);
				bullet.y += bullet.speed * Math.sin(bullet.angle);
			};
			self.parent.heroBullets.push(bullet);
			self.parent.addChild(bullet);
			self.shootCooldown = 60;
		}
	};
	self.update = function (heroBullets, gameContainer) {
		if (self.shootCooldown > 0) {
			self.shootCooldown--;
		}
		self.updatePosition();
		self.shoot(heroBullets, gameContainer);
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var hero = new Hero();
	self.addChild(hero);
	hero.x = 2048 / 2;
	hero.y = 2732 - 200;
	var enemies = [];
	var enemySpawnTicker = 0;
	var enemySpawnRate = 120;
	self.heroBullets = [];
	var enemyBullets = [];
	var healthBar = new HealthBar(100);
	healthBar.x = 100;
	healthBar.y = 50;
	self.addChild(healthBar);
	var ammoCounter = new AmmoCounter();
	ammoCounter.x = 2048 - 200;
	ammoCounter.y = 50;
	LK.gui.topRight.addChild(ammoCounter);
	var weaponIcon = new WeaponIcon('defaultWeapon');
	weaponIcon.x = 2048 - 400;
	weaponIcon.y = 50;
	LK.gui.topRight.addChild(weaponIcon);
	var miniMap = new MiniMap();
	miniMap.x = 2048 - 200;
	miniMap.y = 2732 - 200;
	LK.gui.bottomRight.addChild(miniMap);
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	scoreTxt.anchor.set(.5, 0);
	self.addChild(scoreTxt);
	var dragNode = null;
	hero.on('down', function (obj) {
		dragNode = hero;
	});
	stage.on('down', function (obj) {
		dragNode = hero;
	});
	function handleMove(obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		if (dragNode) {
			dragNode.targetX = pos.x;
			dragNode.targetY = pos.y;
		}
	}
	stage.on('move', handleMove);
	stage.on('up', function (obj) {
		dragNode = null;
	});
	LK.on('tick', function () {
		for (var a = self.heroBullets.length - 1; a >= 0; a--) {
			self.heroBullets[a].move();
			if (self.heroBullets[a].y < -50) {
				self.heroBullets[a].destroy();
				self.heroBullets.splice(a, 1);
			}
		}
		for (var a = enemyBullets.length - 1; a >= 0; a--) {
			enemyBullets[a].move();
			if (enemyBullets[a].y > 2732 + 50) {
				enemyBullets[a].destroy();
				enemyBullets.splice(a, 1);
				enemies.forEach(function (enemy) {
					if (enemy.bullet === enemyBullets[a]) {
						enemy.bullet = null;
					}
				});
			} else if (hero.intersects(enemyBullets[a])) {
				LK.effects.flashScreen(0xff0000, 1000);
				LK.showGameOver();
				enemyBullets[a].destroy();
				enemyBullets.splice(a, 1);
				enemies.forEach(function (enemy) {
					if (enemy.bullet === enemyBullets[a]) {
						enemy.bullet = null;
					}
				});
			}
		}
		hero.update();
		if (enemySpawnTicker++ % enemySpawnRate === 0) {
			var newEnemy = new Enemy();
			var spawnEdge = Math.floor(Math.random() * 4);
			switch (spawnEdge) {
				case 0:
					newEnemy.x = Math.random() * 2048;
					newEnemy.y = -newEnemy.height / 2;
					break;
				case 1:
					newEnemy.x = 2048 + newEnemy.width / 2;
					newEnemy.y = Math.random() * 2732;
					break;
				case 2:
					newEnemy.x = Math.random() * 2048;
					newEnemy.y = 2732 + newEnemy.height / 2;
					break;
				case 3:
					newEnemy.x = -newEnemy.width / 2;
					newEnemy.y = Math.random() * 2732;
					break;
			}
			newEnemy.angle = Math.atan2(hero.y - newEnemy.y, hero.x - newEnemy.x);
			enemies.push(newEnemy);
			self.addChild(newEnemy);
		}
		for (var i = enemies.length - 1; i >= 0; i--) {
			enemies[i].move();
			if (enemies[i].shootCooldown > 0) {
				enemies[i].shootCooldown--;
			}
			if (enemies[i].y > 2732 + 50) {
				enemies[i].destroy();
				enemies.splice(i, 1);
			} else if (Math.random() < 0.01) {
				enemies[i].shoot(enemyBullets, self, hero);
			}
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -50,11 +50,23 @@
 	self.initialX = self.x;
 	self.initialY = self.y;
 	self.speed = -5;
 	self.move = function () {
-		var distance = Math.sqrt(Math.pow(self.x - self.initialX, 2) + Math.pow(self.y - self.initialY, 2));
-		if (distance < 100) {
-			self.y += self.speed;
+		var closestEnemy = null;
+		var closestDistance = Number.MAX_VALUE;
+		self.parent.children.forEach(function (obj) {
+			if (obj instanceof Enemy) {
+				var distance = Math.sqrt(Math.pow(self.x - obj.x, 2) + Math.pow(self.y - obj.y, 2));
+				if (distance < closestDistance) {
+					closestDistance = distance;
+					closestEnemy = obj;
+				}
+			}
+		});
+		if (closestEnemy) {
+			self.angle = Math.atan2(closestEnemy.y - self.y, closestEnemy.x - self.x);
+			self.x += self.speed * Math.cos(self.angle);
+			self.y += self.speed * Math.sin(self.angle);
 		} else {
 			self.destroy();
 			heroBullets.splice(heroBullets.indexOf(self), 1);
 		}