===================================================================
--- original.js
+++ change.js
@@ -2,18 +2,24 @@
 * Classes
 ****/
 var HeroBullet = Container.expand(function () {
 	var self = Container.call(this);
-	var bulletGraphics = LK.getAsset('heroBullet', 'Hero Bullet Graphics', 0.5, 0.5);
+	var bulletGraphics = LK.getAsset('heroBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
 	self.addChild(bulletGraphics);
 	self.speed = 10;
 	self.move = function () {
 		self.y -= self.speed;
 	};
 });
 var EnemyBullet = Container.expand(function () {
 	var self = Container.call(this);
-	var bulletGraphics = LK.getAsset('enemyBullet', 'Enemy Bullet Graphics', 0.5, 0.5);
+	var bulletGraphics = LK.getAsset('enemyBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
 	self.addChild(bulletGraphics);
 	self.speed = 5;
 	self.move = function () {
 		self.x += self.speedX;
@@ -21,14 +27,20 @@
 	};
 });
 var Hero = Container.expand(function () {
 	var self = Container.call(this);
-	var heroGraphics = LK.getAsset('hero', 'Hero Spaceship', 0.5, 0.5);
+	var heroGraphics = LK.getAsset('hero', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
 	self.addChild(heroGraphics);
 });
 var Enemy = Container.expand(function () {
 	var self = Container.call(this);
-	var enemyGraphics = LK.getAsset('enemy', 'Enemy Spaceship', 0.5, 0.5);
+	var enemyGraphics = LK.getAsset('enemy', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
 	self.addChild(enemyGraphics);
 	self.speed = 6;
 	self.targetY = Math.random() * (2732 / 3);
 	self.move = function () {
@@ -45,9 +57,12 @@
 	};
 });
 var StarField = Container.expand(function () {
 	var self = Container.call(this);
-	var starGraphics = LK.getAsset('star', 'Star Graphics', 0.5, 0.5);
+	var starGraphics = LK.getAsset('star', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
 	self.addChild(starGraphics);
 	self.speed = Math.random() * 2 + 1;
 	self.alpha = self.speed / 3;
 	self.move = function () {
@@ -161,9 +176,8 @@
 				}
 			}
 		});
 	});
-
 	// Check collisions between enemy bullets and hero
 	enemyBullets.forEach(function (enemyBullet, index) {
 		if (enemyBullet.intersects(hero)) {
 			enemyBullet.destroy();
@@ -207,9 +221,9 @@
 	if (allEnemiesKilled) {
 		currentWave++;
 		spawnWave();
 	}
-	if (LK.ticks % 5 === 0) {
+	if (LK.ticks % 15 === 0) {
 		fireHeroBullet();
 	}
 	enemies.forEach(function (enemy, index) {
 		if (LK.ticks % 90 === 0) {