Fun game! The controls are a bit clunky! I would probably move the controls from the mouse to the keyboard, either wasd and jkl or arrow keys and wasd, I feel extremely uncoordinated while playing. But, that's just my suggestion! Overall, solid idea and artwork, I really like the vibe! :)
Also found a weird bug where I got pushed under the gravestone and was invulnerable during the boss fight except for the flash attack.