http://tinyurl.com/29vbvl9
Obviously I had a little fun with it. Good way to learn a library, though--and good effort.
(And if you can, try to play my game again. I fixed the instructions to make it a little bit more obvious how to shoot collectors.)
For those looking for pygame at:
http://www.pygame.org/download.shtml
By the way, the Windows pygame installer CRASHES unless you run it as administrator... (cheap!)
Once I got it running, well... arrow keys did move the UFO. But that was it. Is that all there is? If so, well... umm... I'm sure it was a good learning experience, and for that, well done.