Started this last night to show my son the app, he mentioned flappy bird, but i ended up with this instead.
Really happy with the code on the ufo in the background. It can do some interesting things during the game. I had it checking position off the shuttle at first, but the change to making it only follow the player jump command really made it better, while also fixing the runaway size problems i was having. Its pretty hard, but not that hard. I guess game tuning is a art of its own.