Personally I'm not a huge fan of the roll for exits mechanic as that makes my little goblin brain think it NEEDS to make a map. Personally I would rather not have to make a map, especially for a game i can (and currently do) fit in my wallet. Though I really like the idea of passing a monster as that offers more choice. My first thought is that you can pass a monster before you figure out what it is. But after you roll to see what the monster is, you have to fight. Maybe you can skip a monster but at the risk of the next one being stronger? Perhaps the path to the next floor unlocks after you defeat a boss?