Rock Blaster - 1.0

This is my first attempt with writing a Pygame game. It's pretty simple at this point. Blast away to earn points until you die. I plan to add an ending and more interesting enemies later. I'm new to this and constructive feedback is appreciated. Thanks! Note - The poor artwork is mine, but I used a Nasa (public domain) image for the background.

New features added to Rock Blaster 1.0: Highscores saved between games; 3 levels; Screensize and shipspeed adjusted.