Looks like I'm not he only one who would love some more lenient hitboxes for hitting the boss.
The animations and art are great here. Lots of character smashed into a couple sprites. I wish the song was a bit longer given that the song loops 10+ times during a playthrough. I do like that there are multiple songs in the game. Overall a good submission, though I'd have loved to see a little more variation in the boss pattern.