I see what this is going for but for now the sameness of the skellies kinda kills it, they're all pretty much the same and it seems like you can out-heal their dps pretty easily after a couple of level-ups
The game should probably show your character's healthbar on his model alongside the other NPCs for readability
It would also be useful to see the sweetspot of some spells, like Holy Light has an upgrade that makes it more powerful at 10 meters and that could be shown when hovering over the spell.
Maybe spells that require you to be still to cast should stop your character instead of giving you an error.
I ran around the first floor for a while, the exit tracker led me to the top-left corner of the map instead of the exit:
