I also added the turtle enemy. It is very slow and big, and takes 10 hits to kill. Considering you can do rapid-fire, that isn't really hard. They are worth a lot of coins though.
I also py2-exe built the program so people can test it. This usually takes a long time, but in last years contest, I found a tool called pygame2exe that did some of the dirty work if you had configured it properly. The compiled files are here, (just extract and run main.exe) If a few people could try it and comment on the music, the FPS, and anything else it would be nice.