I wish rats were not nuclear bombs with simply a small chance to fail to explode. I would have liked to complete the game during the jam. I think I went quite far exactly once, got three successive keys (None, Chamber, Snoss).
The intro is cool.
The dungeon looks very good. Movement feels good enough and I like the combat system and the one-time-usage cards as rewards. Overall the difficulty feels right too as there's no checkpoint, you must be careful of what you're doing if you don't want to die. I like that sanity carries over battles but health does not.
I think combat is very slow but maybe if I had not restarted 50 times because of the game breaking rats then I would not feel this way.
This is a cool entry, I'll play a fixed version if you ever release it.