Rodrigo, I'm looking into that right now. I was thinking, would it be fun that every completed dungeon makes the game harder? So like the second run, you have 20 max HP
Just popped in to report the escape room bug, but it's already been reported. (Loving the game btw)
I'd personally love that kind of streak system that makes dungeons a little harder each time you win consecutively (definitely make it reset to 21 when you lose though). Something as simple as -1 max hp per consecutive dungeon-win, like you mentioned, would be great for replay value. It would obviously get impossible at a certain point, but that only adds to the excitement when you getting lucky and survive at very low health.
*edit* While I'm here, a fullscreen option would be nice. The game window is very small.