Lots of fun, I really liked the pacing, it was a good level of frantic-ness. The mechanics used in the rooms felt solid and fit well together. And getting a game over, the way it just cut to the menu, was hilarious to me.
I think the biggest thing that could be improved would be balancing the difficulty. I imagine this would take a lot of time and testing, so it's understandable since this was made during a jam. Some rooms, mainly the lightning room actually, felt unfair. Either nerfing those rooms a bit, or making gems for those rooms spawn in easier-to-reach places would probably be good. Having each floor be of increasing difficulty and size would also be a good thing to have, but this definitely would take a lot of time and effort during a jam; this is just something if you had more time. And along with that, I think changing the score to be number of floors beaten as opposed to gems collected would make more sense. These are just small suggestions, overall the game felt good and mostly fair. Also, gotta love Morgan Freeman mode.