It was more fun than I expected!
I managed to beat the game with a 5850 high score. You have used the resolution restriction gracefully, awesome visuals! The audio was also great, it was resembling the action very well. Enemies were hard enough to pay attention to deal with but not so hard that they'd cause frustration, good job on those too!
Overall, it was an exciting game and had me playing it for a few minutes, awesome job!