nice looking
You've got great graphics here, but you need to adjust some of the values for the ship controls. Add a bit more thrust and increase the turning speed, then it should be good.
I didn't see any during my game, but powerups would be nice too.
And at the beginning of each level, you're going to want to teleport the ship back to the middle of the screen.
Fox those things and it's a very nice looking asteroids remake.