It's amazing how much can be achieved with such a simple game engine.
The only issue I found so far is that there is too little informattion about how to use the "skip level" feature (which is useful to continue playing the game on another day). I'd suggest moving the hint from page 11 to page 9 of the Dungeon Survival Guide, as I hesitated to look for it for too long.
But anyway I'm not unhappy because in the end it was just another puzzle to solve, haha