This was surprisingly fun! I liked the animations of throwing the tombstones around the map, and I like how you flashed which grave was the correct one to put the grave on. It would be interesting to play with this idea in a higher resolution where you have to match what the names are or something!
I did hit a couple bugs where the zombie definitely hit me, but instead of dying I just slowed down to barely a crawl. This usually happened around corners of tombstones, and once my sprite broke free, it was like nothing had happened.