Fun game, I like the ability set and reroll mechanism. Some of my personal opinion:
The map is a bit small, when there are a lot of enemies I end up drawing circle because I don't have enough room to go around the other way.
I'm not sure if there is an ability that allows you to heal when you do damage, but the cost of reroll is a bit heavy especially towards the later levels. I think having some collectables to be the cost of reroll will be better and players can decide to pay health when the collectables are not enough.