A really nice concept, loved the endless possibility, and the idea to merge a deck builder with a memory game.
The game need however, probably some balancing, as it seems a lot unfair especially with the first levels where the boss have too much cards.
The system to turn the card, and activate them, or not, seems a little cranky times to time (Card not out of focus, or, not clear with the effect), but it was a really nice game
I really liked playing it, the crankiness of the controls beeing the only things that kept me from playing it for hours.
Keep the good work, if you finish the polish of this game, be free to @ me I would love to play a complete version.