It would be cool if we'd be able to rich the surface from more than one hole from the underground map, can that be a feature to the game? I am assuming it might enhance the player's strategy options.
I agree with our friend about secrets and mini bosses.
Imagine how cool it would be to have some small "forbidden" region on the map (tempting to explore because maybe easy access to resources) where the player can get his ants infected with cordyceps fungus parasite and have a small animation...