My favorite concept I've seen so far, I got really into it, even showed some non-jam friends. I would get a bit frustrated at the controls, I sometimes forgot what direction the arrow keys would send me (the slow down when my own bullet was about to hit me was much appreciated). I wonder if adding mouse based movement would help me understand the directions better.
I wonder what it would feel like if you had multiple loops floating in space and sometimes they would overlap and you could jump between loops or something, but that might take away from the simple but powerful nature of it. I'll definitely be returning to this post jam to try and beat my high score.
I think a more ambient synth based soundtrack would really lock the entire mood.