A respectable effort! The game does look pretty nice, the boss design is great, and the music works for me.
That said, it definitely needed some more time in the oven, haha. In my first attempt, I couldn't fire at all, and the boss disappeared after a second or two. Restarted, tried again, and this time it worked as intended, but I think the boss has some attacks that are straight up impossible to dodge? I was MASHING dash and the small projectiles still seemed like they're too fast to evade. Restarting the fight didn't kill the music, and at some point I had three instances of the BGM playing at the same time. Seems like a fun concept if you can work out the controls and take your time with the polish.