Cool concept and good execution. I really like the art and I found the flying and shooting mechanics to be fun. I didn't like how the levels just sorta stopped, both in how the text pops up and how the boundaries of the space were just invisible walls that I kept running into. I got a bit lost in some levels and took a while to find the enemies. I liked the increasing difficulty, health pickups, and the effects on hits, though some audio feedback would be nice on that as well. Overall, excellent job!