Nice game! I like the art, animations, music and sound effects (the marimba sound for the skeletons is great) -- all well done, and the game is fun. I couldn't get the bite to do any damage, but the punch and 'blood rain' did the trick to make it to the end of what you completed.
Some hopefully helpful feedback: an auto-respawn after being defeated (rather than asking player to push R) would be a nice addition, and disabling player input after defeat would be good to prevent punching noises when you push Space after you're a pile of ashes.
Nice job!