A nice little dungeon crawler! However, I have some points that IMO would elevate the experience:
I like the movement, feels rather fluid, but the attack is weird: I couldn't understand why the enemies sometimes take damage, sometimes don't. I also noticed that my health wasn't dropping then I was being attacked.
Regarding the attack animation and damage flashes, I'd suggest making them faster, especially the damage flash one (so that the enemy gets red instantly but then fades back to its normal color in a bit). Adding to the visual aspects, some of the sprites have incorrect rotation.
Finally, the skeletons apparently stop shooting when you get close to them which makes fighting them way too easy for me.
That aside, nice use of the theme and good job on the game!