This was a fun little game! As soon as I heard the music and saw "fly" in the instructions, I knew it was going to be good :)
The movement was fun. You go really fast, which means things can really zoom by; I may have missed some things as a result, but it's fun to go fast, so I'm not complaining. The movement takes some getting used to, but once you have it down, it was very satisfying to combo bounces on the enemies. The boss fight was a fun addition at the end, too, though nothing too challenging once you have the movement down.
The graphics are nice. Nothing fancy, but good spritework and everything all fit cohesively. The music was intense, which I think fit pretty while; hearing the double-kick pattern set in while you're blazing through the level all felt cohesive.
My biggest real critique is that I think the game could really benefit from some feedback (both audio and visual) when you get hit. Right now I wasn't sure whether I got hit or not without looking up at the health bar, which pulled me out of the game a bit, so to speak. I think other sound effects would also really help flesh this out, but the biggest thing is the lack of feedback when getting hurt / hurting enemies.
All-in-all, a very nice jam entry. I really enjoyed it. Nice work!