Game help, again .

Alrighty, this time I am going a much easier way than an RPG. I liked Ry12's idea for an Alien Shooter type of game so I figured I would attempt one myself. I have gotten a lot of it done myself probably isn't the cleanest code but, it works... well almost for me. lol
Here is my problem I have two really,one: It was working fine up until well I don't really know what I changed, I usually save changes made and test it right away I guess I didn't this time, and well now the Aliens are flickering rather fast and not workinng to well.
two:When the Aliens get to one side of the screen they go back towards the other side just fine, but once they hit the other side they all get stuck besides one he then goes back to the other side and gets stuck there going back and fourth REALLY fast.
But yeah, if someone could help me that would be great. Thanks.
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