Holy shit. This is the best game I've played so far in the jam. The concept is so interesting, the gameplay feels so satisfying, and the art and music are top notch. I really think that you could make this a full game!
The only two pieces of feedback I have are that:
1) The spinning could have been incorporated a bit more
2) Perhaps rearrange the bosses a bit? Unlike others, I do actually think the final boss was challenging, but the second boss was almost trivial compared to the first one (especially with the move that fires 6 bullets upward where I can farm attacks). Maybe flip those two around?
Truly fantastic work, super excited to see this go further!