===================================================================
--- original.js
+++ change.js
@@ -1,5 +1,35 @@
 /**** 
+* Classes
+****/ 
+// PlayerShip class to handle player ship logic and projectile spawn point calculation
+var PlayerShip = Container.expand(function () {
+	var self = Container.call(this);
+	// Attach player ship sprite and set reference for spawn point calculation
+	self.shipSprite = self.attachAsset('playerShipSprite', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Initialize projectile spawn point
+	projectileSpawnPoint.x = self.x;
+	projectileSpawnPoint.y = self.y - self.shipSprite.height / 2;
+	// Update projectile spawn point every frame based on player ship position
+	self.update = function () {
+		// Calculate spawn point at the tip of the ship (center top)
+		// Get ship asset size
+		var shipAsset = self.shipSprite; // must be set in constructor
+		if (!shipAsset) return;
+		// Ship's local center
+		var centerX = self.x;
+		var centerY = self.y;
+		// The tip of the ship (assuming orientation:2, so tip is at y = y - height/2)
+		projectileSpawnPoint.x = centerX;
+		projectileSpawnPoint.y = centerY - shipAsset.height / 2;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
 ****/ 
 var game = new LK.Game({
 	backgroundColor: 0x000000
@@ -12,25 +42,5 @@
 // Will be updated in PlayerShip class update
 var projectileSpawnPoint = {
 	x: 0,
 	y: 0
-};
-// Update projectile spawn point every frame based on player ship position
-self.update = function () {
-	// Calculate spawn point at the tip of the ship (center top)
-	// Get ship asset size
-	var shipAsset = self.shipSprite; // must be set in constructor
-	if (!shipAsset) return;
-	// Ship's local center
-	var centerX = self.x;
-	var centerY = self.y;
-	// The tip of the ship (assuming orientation:2, so tip is at y = y - height/2)
-	projectileSpawnPoint.x = centerX;
-	projectileSpawnPoint.y = centerY - shipAsset.height / 2;
-};
-// Attach player ship sprite and set reference for spawn point calculation
-self.shipSprite = self.attachAsset('playerShipSprite', {
-	anchorX: 0.5,
-	anchorY: 0.5
-});
-projectileSpawnPoint.x = self.x;
-projectileSpawnPoint.y = self.y - self.shipSprite.height / 2;
\ No newline at end of file
+};
\ No newline at end of file