Very interesting game, had a lot of luck by the end to win :D

I'd say it needs a bit more variation to hold my attention for longer, maybe 1 or 2 more special cards, maybe if the actual placement of a card had an effect on the game so that you're incentivized to burn cards closer to opponent's tower (I'm actually not sure if you can burn his tower before he opens all his cards, but that would make sense to me). Maybe special card that allows you to rearrange cards would make sense in combination with previous mechanic.

I'd say you're on the good track, I very much like the art style although would prefer a bit shorter animations for opponent's turns.