The level aesthetics and enemy variety are really awesome. And the use of different camera angles and styles is cool. This game really challenged me, and was really satisfying to beat! I enjoyed the change in music in different sections.
I found the camera during the boss fight to be completely broken though, which became frustrating and made it hard to really appreciate the cool attack patterns. To be specific, it kept zooming right in so I couldn't see anything (I think it was clipping on walls and the boss itself?) I'm also not sure if I made it to the very end? I got to the room after the boss, and the text which ended in 3..2..1.. implying something would happen, but I waited several minutes and pressed every button, so assumed that was how it ended.
Cool game though! I'd recommend significantly toning down the difficulty in future jams (or adding an easy mode at least). I really enjoyed the challenge, but people of a wide variety of skill levels like to participate in jams, and it'll be hard to get a lot of people to play and appreciate your entries if they can't progress far.
Superb game, especially for a solo entry!