===================================================================
--- original.js
+++ change.js
@@ -41,131 +41,139 @@
 }); //{26}
 //{27}
 var Game = Container.expand(function() {
     var self = Container.call(this); //{28}
-    //{29}
+    // Add stars to the background
+    for (var i = 0; i < 100; i++) {
+        var star = XS.getAsset('star', 'Star', 0, 0);
+        star.x = Math.random() * 2048;
+        star.y = Math.random() * 2732;
+        star.alpha = Math.random() * 0.5 + 0.5;
+        self.addChild(star);
+    } //{29}
+    //{30}
     var hero = self.addChild(new Hero());
     hero.x = 1024;
     hero.y = 2400;
-    //{30}
+    //{31}
     var enemies = [];
     var heroBullets = [];
     var enemyBullets = [];
     var score = 0;
-    //{31}
+    //{32}
     var scoreText = new Text2('0', {
         size: 100,
         font: "'GillSans-Bold',Impact,'Arial Black',Tahoma",
         fill: "#ffffff"
-    }); //{32}
+    }); //{33}
     scoreText.anchor.set(0.5, 0);
     XS.gui.topCenter.addChild(scoreText);
-    //{33}
+    //{34}
     function spawnEnemy() {
         var enemy = new Enemy();
         enemy.x = Math.random() * 2048;
         enemy.y = -100;
         enemies.push(enemy);
         self.addChild(enemy);
-    } //{34}
-    //{35}
+    } //{35}
+    //{36}
     function fireHeroBullet() {
         var bullet = new HeroBullet();
         bullet.x = hero.x;
         bullet.y = hero.y - 50;
         heroBullets.push(bullet);
-        self.addChild(bullet); //{36}
-    } //{37}
-    //{38}
+        self.addChild(bullet); //{37}
+    } //{38}
+    //{39}
     function fireEnemyBullet(enemy) {
         var bullet = new EnemyBullet();
         bullet.x = enemy.x;
         bullet.y = enemy.y + 50;
         enemyBullets.push(bullet);
-        self.addChild(bullet); //{39}
-    } //{40}
-    //{41}
+        self.addChild(bullet); //{40}
+    } //{41}
+    //{42}
     function updateGameObjects() {
         enemies.forEach(function(enemy, index) {
             enemy.move();
             if (enemy.y > 2732) {
-                enemy.destroy(); //{42}
+                enemy.destroy(); //{43}
                 enemies.splice(index, 1);
-            } //{43}
-        }); //{44}
-        //{45}
+            } //{44}
+        }); //{45}
+        //{46}
         heroBullets.forEach(function(bullet, index) {
-            bullet.move(); //{46}
+            bullet.move(); //{47}
             if (bullet.y < 0) {
-                bullet.destroy(); //{47}
+                bullet.destroy(); //{48}
                 heroBullets.splice(index, 1);
-            } //{48}
-        }); //{49}
-        //{50}
+            } //{49}
+        }); //{50}
+        //{51}
         enemyBullets.forEach(function(bullet, index) {
-            bullet.move(); //{51}
+            bullet.move(); //{52}
             if (bullet.y > 2732) {
-                bullet.destroy(); //{52}
-                enemyBullets.splice(index, 1); //{53}
-            } //{54}
-        }); //{55}
-    } //{56}
-    //{57}
+                bullet.destroy(); //{53}
+                enemyBullets.splice(index, 1); //{54}
+            } //{55}
+        }); //{56}
+    } //{57}
+    //{58}
     function checkCollisions() {
         // Check collisions between hero bullets and enemies
         heroBullets.forEach(function(heroBullet, hIndex) {
             enemies.forEach(function(enemy, eIndex) {
                 if (heroBullet.intersects(enemy)) {
                     heroBullet.destroy();
                     heroBullets.splice(hIndex, 1);
-                    enemy.destroy(); //{58}
+                    enemy.destroy(); //{59}
                     enemies.splice(eIndex, 1);
                     score += 100;
                     scoreText.setText(score);
-                } //{59}
-            }); //{60}
-        }); //{61}
-        //{62}
+                } //{60}
+            }); //{61}
+        }); //{62}
+        //{63}
         // Check collisions between enemy bullets and hero
         enemyBullets.forEach(function(enemyBullet, index) {
             if (enemyBullet.intersects(hero)) {
                 enemyBullet.destroy();
-                enemyBullets.splice(index, 1); //{63}
+                enemyBullets.splice(index, 1); //{64}
                 XS.showGameOver();
                 // Handle hero hit by enemy bullet
-            } //{64}
-        }); //{65}
-    } //{66}
-    //{67}
+            } //{65}
+        }); //{66}
+    } //{67}
+    //{68}
     function handleTick() {
         updateGameObjects();
         checkCollisions();
-        //{68}
+        //{69}
         if (XS.ticks % 60 === 0) {
             spawnEnemy();
-        } //{69}
-        //{70}
+        } //{70}
+        //{71}
         if (XS.ticks % 30 === 0) {
             fireHeroBullet();
-        } //{71}
-        //{72}
+        } //{72}
+        //{73}
         enemies.forEach(function(enemy) {
             if (XS.ticks % 90 === 0) {
                 fireEnemyBullet(enemy);
-            } //{73}
-        }); //{74}
-    } //{75}
-    //{76}
-    XS.on('tick', handleTick);
+            } //{74}
+        }); //{75}
+    } //{76}
     //{77}
+    XS.on('tick', handleTick);
+    //{78}
     stage.on('down', function(obj) {
-        var pos = obj.event.getLocalPosition(self); //{78}
-        hero.x = pos.x; //{79}
-        hero.y = pos.y; //{80}
-    }); //{81}
-    //{82}
+        var pos = obj.event.getLocalPosition(self); //{79}
+        hero.x = pos.x; //{80}
+        hero.y = pos.y; //{81}
+    }); //{82}
+    //{83}
     stage.on('move', function(obj) {
-        var pos = obj.event.getLocalPosition(self); //{83}
-        hero.x = pos.x; //{84}
-        hero.y = pos.y; //{85}
-    }); //{86}
-}); //{87}
\ No newline at end of file
+        var pos = obj.event.getLocalPosition(self); //{84}
+        hero.x = pos.x; //{85}
+        hero.y = pos.y; //{86}
+    }); //{87}
+}); //{88}
\ No newline at end of file