Took me a few attempts but managed to beat it in the end! :D
I quite liked the different mechanics that were at play depending upon whether you were acting as a priest or a demon (I also found the digging pretty satisfying). My only complaint would be maybe to have the priest be able to heal quicker, I found I had a 5-10 second period of waiting after each battle. It wasn't a big deal though, minor issue overall :)
Nice work!