That's a difficult subject to broach without going into spoilery territory... Once out of the opening section - in which dead men awaken as they never expected to - the story after insertion should be a semi-free-form affair with several planned events and heavy NPC interaction. I want the city - for indeed, the aliens have built what is effectively a city around the landing site, which serves as their main base of operations; their capitol, as it were - to feel alive, and to do that, I need more than just the RP's participants.