The game feels pretty fun to play, and I like the graphics.
The ability to use controls is nicely indicated on the character itself, although I thought these were thrusters that push you, not pull. Speaking of indication, I wish these bars were placed somewhere around the parts (engines, gun) themselves, as it's hard to look at the sides of the screen while avoiding and shooting enemies. Also, I think difficulty curve could be a bit smoother.
Overall, great job!