Fun Little Game
It's a fun game, although nothing spectacular and boredom quickly rushes in once you 'get it'. I would definitely like to see you expand upon what you have here by adding more enemy types and various upgrades. Faster speed, the ability to shoot, maybe even some limited steering. There's really a lot of ways you could build upon this idea.
I got bored around 100k in score. Doesn't really seem to be much variation past 10k.