Interesting idea! One change I would for sure make is to make the projectiles larger and faster. I pretty often see people make projectiles tiny and fairly slow moving, when the opposite feels so much better. Even if they were the same size, if they moved faster it would feel a lot better. You don't have to worry about it making the game too easy, as you can adjust the difficulty of the enemies to compensate (these are all ideas I've internalized from JW's The Art of Screenshake talk, I would definitely recommend watching that if you haven't!) Otherwise, I really like the visuals, and the music and sound is really nice too. Spinning to reload reminds me of Synthetik for some reason, even though that game doesn't use any sort of motion to reload. It's pretty fun! I like it :)