Awesome game! I made it to 20 rooms (I died because I got so in the zone that I forgot I had completed a level and walked around for a few seconds before realizing.)
The combat is fun and I love how late in the game it starts to feel frantic. "I need to get that guy right there or I'll die!." It makes the game very satisfying.
The game did lull a bit in the 9-14 level range. My health wasnt dropping fast enough for me to worry about it and there weren't any new enemy types in that range, so the gameplay got a bit stale. maybe the scaling could be adjusted to skip to the more frantic parts a bit quicker.
But in any case, really fun game.