Thank you for your kind words!
I'm aware of the boss close range attack not being noticeable, I felt the same way when I playtested, I wanted a curated animation for it, but didn't have any more time.
As for the music, I got it from another artist online, you can see from the credits section, I felt it matched the style.
I already started making a cool themed song to replace it, I might resubmit later on after the jam.