Last year, I praised the Facebook game Lucky Space, a space-mining strategy game, for being a) more complex than the average Facebook game and b) fun. Then I forgot to keep playing it, and at some point, perhaps recently, the game was yanked from Facebook?
Most of the Facebook games that I try lack something important. They don't ask me to make interesting choices. They just let me click a lot. They let me do obvious things like collect 10 of this thing so I can build one of that thing.