The tower defense genre has been one of the more popular of the app store, patrly due to the simplicity of its touch controls. Space Station: Frontier takes the simple controls and gameplay of tower defense and adds the base building, expansion, and resource management of the RTS genre. As a mining operation on the outskirts of the solar system, you are attacked by a hostile force, and must defend your operation.
If you've played a tower defense game, you know the basics. Drag a tower to place it on the map, and touch it to either upgrade or sell. What differs is that you need to create power chains linking to your main base which you can attach miners and defensive equipment to. The miners mine the ore rich asteroids littered around the map which you then use to build units, upgrade them, and extend your reach.