Not bad, but there were a couple of gripes 1. I REALLY would have liked the option of moving with the mouse instead of the keyboard, 2. in later stages. those satellites, space junk, and asteroids were being rendered as foreground objects even though they were treated as background. it wasn't fun aiming at a harmless asteroid while actual enemies were still running around. overall, though, pretty good effort for what looks to be your first game. Love that boss theme too.