I think you managed to make the game spooky and I really like the cool effects that the gravestones have, like the fact that they react to your hits and that they sometimes glow. And the growls that the enemies make are very well chosen.
And bonus points for implementing a cool menu to the game!
You mentioned expanding on the idea in the game page, and I hope you do that. Hope to see more of this game in the future. Great job!