We played this last night and everyone had a very good time. We created a really interesting town on an alien planet built into the walls of a canyon (because the environment up outside the canyon was dangerous and inhospitable). In the time between Then and Now, a stonemason union led a communist revolution and overthrew the old government. Both the Remained characters had complicated feelings about what they did during the revolution, while the Returning characters had to find a new place within this changed society.
This game did everything I wanted, of telling a emotionally moving story through drawing maps and of making us think about the passage of time. It's really great.