At first, I didn't understand anything. I had to read the tutorial several times after my first session to grasp the idea behind the game. I know it's a lot to ask for a 7-days game jam, but a bit more guidance on the first level would have been great ^^.
Then, I finally understood. And oh boy, this game is awesome! It's a really clever take on the theme, and a very original game in general! The graphics are great and fitting, the music and sound design creates a nice atmosphere, the gameplay is strategic and really interesting, and the uniqueness of each room is an awesome touch! I really enjoyed the idea, and honestly would love to play a more polished version of it after the jam (please ping me if you upload a new version ^^).
The difficulty curve is a bit too brutal: I'm not *that* good on deck building games, but I couldn't clear a single level, always falling a bit short at the end (always during the last room xD). Don't be afraid to make a very easy first level, and then go nuts on the last ones ^^. It also goes into the "tutorial" aspect of the game, but I would have appreciated if the first level was just a single room and 2 types of cards, just to understand the goal and the controls. Then, level 2 would have added the "move to another room" mechanic and more cards, and so on.
The reason I'm insisting on that is because I feel like this game is a gem that, unfortunately, not a lot of people will appreciate because the discovery is painful. It takes time to understand the beauty of it, and I'm afraid not a lot of jammers will do the effort (please, jammers, prove me wrong!).
So yeah, it's an awesome and original game with interesting mechanics and strategy, and I would love to see more of it! You really have something between your hands with that concept ^^! And for your next jam, focus on the difficulty curve: start very simple and slowly add mechanics ;)