Cool game! Visuals are great, animations are great, sounds good, everything works, there's a beginning middle and end, good work! I saw yall had ideas and ran out of time, jams gonna jam :) This is still a great entry!
Friendly feedback: As others mentioned the boss's hitbox is quite unforgiving. I wish I had seen some kind of different bullet patterns because every attack I could see was a straight line. I never figured out which items were safe and which were bullets, maybe that's my bad, but you could consider using a "pick-up" icon above the good stuff?
There isn't much "content", I'm totally okay with that, but I'm not sure the Boss's health needs to be as high as it is because it feels like padding, especially since there aren't any phases or anything.
Anyway, great game overall, just wish there was a bit more to it and a little better tuning.