I wasn't exactly sure what I was supposed to do and was bored following the guy around. I jumped off the map (subsequently had to restart, couldn't find a death plane), Went down the tunnel to find a mole man who I followed to the surface, and died via lung cancer.
Besides this, I really liked how smooth the player controlled and how the footstep sound changes depending on what surface you're walking on. I had some trouble with the menu, though. Nice game!