I am currently running a test round for a text based space game that is being ran as a facebook app. It can be accessed at http://myfbpa.com
You signup by choosing a name for the leader of your planet, and a name for your planet. You are then placed into a random galaxy in the universe. Every 5 seconds you gain resources based on how many asteroids you have. You can use Technology points to unlock new ships and technologies. As you gain more resources, you can build ships to attack other players, and steal their asteroids.
In the deep crevices of the Universe, there are bots which randomly attack players. Players can spend their time attacking bots and players and stealing their asteroids, as well as completing quests to obtain XP points. XP points can be used to buy resources, asteroids, and newer Technologies.
As you gain asteroids, resources, ships, and other technlogies, your score goes up. The goal of the game is to end the round with the highest score.
Give it a shot, I'm open to any suggestions as well