This was a ton of fun, even if it was a little difficult to control. I had a blast just flying around trying to dodge asteroids and evade the space cops. I was only able to get a high score of 11, but I'd love to know what the threshold is to end the game -- I'm assuming there's some point where you collect enough crates to save the Earth. Graphics are simple but nice, especially the use of parallax to give a sense of depth. Having that planet looming in the background and changing as you collect crates was a great touch.
All in all, this is a great entry, good job!