Inscryption

Inscryption is a card/puzzle game that has to battling an unknown entity in a room/purgatory, learning clues as you play to unlock things in the room that enhance your deck to get further.

The mechanics are pretty straightforward and enjoyable as you enhance your deck, but the main part of the gameplay involves working around the ways a boss can cheat (steal your cards, destroy everything, etc).  

What is unfortunate and made me stop playing is that you are not working on a main deck/card/anything -- if you die, you try again.   That's tolerable when you are 5 minutes into a game, but as you progress - the end boss you have to figure out how to cheese is 30-45 minutes deep.