Interesting, too bad there is only one "room" for now, and you really need to have low ennemy counts from the get go to have a decent chance at winning.
i see future update has feature to keep deck over repeat, but perhaps make it a "only get to keep x ammount of cards over the next playthrough" would be better and more enticing than keeping the whole deck.
I like the transformation tid bit. Even if a bit limited, i love the wolf deck, specially for its no cost cards. So unfortunately i'll be getting more wolf transformations. Perhaps making it dependent to the ennemy you're facing at the moment of dmg is better?