I think the game should be a kind of rpg. definitely have classes and stuft but it should also be kinda like a simulation game. Maybe all of the feelings in the world have been turned into drugs and nobody can feel naturaly (except a few who are held up in a lab and a small army of rebels) so you choose what side you start aND go on quest in order to fulfill your destiny. And you could change sides, enslave the world, or whatever. Your choices impact the end.