Hey, that's Mad Rat Dead... Except protagonist is little more OP by not having adhere to rhythm and having ability to just fly with spamming attack :D
Really liked concept and gamehas a lot of content, I think I sometime somehow activated hadouken? I like that moveset is quite complex, like there is difference between forward jump and backward jump, but bunnies attack slow and have hurtbox during whole animation, even when their sword is already at rest position, that moved me to just fly through rest of the levels by spamming :P