Fun game.  I had most of my bullets hit an invisible wall in front of me that I assume was my own collider.  You may have the bullets on the same physics layer as the player's collider.  If you puts the bullets or the player onto a new layer and remove collision between the two it'll fix that issue.

aaaah sweet sweet jojo reference, nice game tho you kind of jump a little too far and what I found funny was that when you kill an enemy on a bouncy pad and let his body hit you, you fly very high.

your game is amazing, the only thing is that you can only go out if you complete the game.

And the boss really have twisted laws :).