Very good, it one the best results of the shootorial! :)
But I think for a very good game there must be a little bit more like different bosses with special weapons and that have one or two points where it is posible to kill them, differnt level-styles, more enemys...
But I give you a 4/5! ;)
At the start a error is raising:
TypeError: Error #1010: Ein Begriff ist nicht definiert und hat keine Eigenschaften.
at BalloonGame/spawnBalloon()
at BalloonGame()
 "Amazing Shooter Of Great Skill!"){kind=icon}
 "Balloon Game"){kind=icon}
 "Alfonz Shooter"){kind=icon}
 "Square Divide 1.0"){kind=icon}
 "Avenue of Death"){kind=icon}
 "Escape the room 2"){kind=icon}
 "get back to the castle"){kind=icon}
 "Gangsta Wars"){kind=icon}