Amazing work! One of the better games I've played this jam for sure, I think you found a fun mechanic and had enough variety to keep it building and keep me coming back for another. I think tweaking the room selection to make it more of an actual decision the player has to make (I basically always had enough gems to buy all the rooms) would elevate the strategic elements of the game. Fantastic art and sound as well, in terms of aesthetics and gameplay this is an all around great job!