I like it! A unique take, once you get used to the controls it can be really fun. I like how everything wraps around on itself in the center so you can get some major chaos theory going.
I might make the asteroids a bit of a different color though, only because it was hard at times to tell asteroids from the ship or the stars. It also was a bit of a struggle to get some of those asteroids to really get going but sometimes that helped set up neat strategies.