Very nice take on the theme and really nice sprites!
I feel like there needs to be some sort of limit to how much healing the player can take from priests. To me, the optimal way to play seems to be just pressing left and right repeatedly (so that the wizard effectively stays in place without taking damage over time) while surrounded by priests. This way I could offset any damage taken from damaging priests since I would be always be hit by priests.
Overall, a great submission!