Interesting to say the least.
Ups: The graphics and concept of the game is pretty nice.
Downs: The BG music, the sound the emitter makes, and the overall game just gets old fast. While I can see what you're doing with the coloring, but sometimes everything's moving by so fast that you can't even bother to get a closer look to tell what's a powerup and what hurts you.
In a nutshell: The game has a nice base to it. Perhaps a little hard and repetitive, but if you add a better learning curve, varied difficulties, and some extra details, this game could turn into something great.