OK, so I’m going to try to finish this one off. I’m off to a decent start too, having managed to get from 7-4(ish) to 9-3. Yeah, so that’s not many levels, but it’s really quite hard now and some levels are taking 20+ attempts.
I think Floor 10 is the last one. It certainly implies that the “Demon’s room is on the next floor” or something.