Polishing the Idea:

After some though i polished my idea and came to the conclusion that i should let the Game Play Underground most of the time this would make it possible to add a deeper layer to my game and make it much easier to get lost in a labyrinth like underground system. Your goal is still to reach the Igloo, but it is much harder now than just walk you have to carefully think which route you'll take and if you should stop at the fire-camp or  run for it.