I enjoyed the concept. But I think the controls are confusing when you leave the bottom of the screen, although they're well implemented (you could try to invert the controls when you are on top, after release button, and "un-invert" when on bottom after release button). And I think instead shooting to the center, you could make the ship shoot forward all the time. In my opinion, this would not impact gameplay so much and you would need to rotate the pixel ship, considering this resolution. The visual effects are nice, and the song is cool. I think this game is would be better in a higher resolution, with vector or 3D graphics (for being able to rotate the ship).