So i have put like 8hrs into this game the last couple of days and I have to say I enjoy it quite a bit. One thing I want to mention though poison decks although difficult to start with seem a bit broken to me. I basically created a deck were I continue to stack enough poison on all enemies before they can react once to defeat them all at once on their first turn. With this completed deck I ran through like 4 or 5 stages (not individual fights) without taking a single point of dmg.
*Additional note I played the current free version.