This is an all around excellent submission, really blown away! I loved that the tutorial checked if you used every input before opening the door. Your music is fantastic and fitting for the setting. The first boss training dummy is really funny, the effects when you defeat a boss are great. You've got charming loading screens, character customization with hats, cute credits, and the lets go gambling sound effect on losing the slot machines made me laugh and kept me there for quite a while.
More importantly though, each boss is distinct with their own unique attacks and feel, and I really loved this submission. Amazing job can't wait to see more!