Hey, at least my game got compared to Hearthstone, right? :D
And yeah, I didn't have time to make a proper balance pass, although it could just be that the game's core idea is too random and can't be balanced in a good way. I plan to explore that later this month or next. :)
(A strategy that seems to work very often for me (at least in the first levels) is to just cast everything on the enemy. Not too exciting, I know :D )