I had fun playing! There is an area in the center of the screen that never sees any action, so I just hung out there, haha. I think the boss might have too much health, though, and there's some noticeable framerate drop after a few minutes in.
Unfortunately my time ran out super hard towards the end of the jam, and I couldn't actually polish the boss's bullet patterns, which leads to a lot of dead zones and performance issues. : (
I hope to make a patch for the game at some point after the jam duration. I'm glad if you still had fun!