Your asteroid base has been hit by an asteroid storm and is tumbling around while your fleet of ships have only enough oxygen to land there or die trying. The problem is there is only a set amount of time before the shields weaken and the doors have to be closed leaving your ships stranded. With each ship that does land you can take some of it’s shield power that will give you those extra few seconds to bring in more ships.
Tilt the screen to move your ships and touch screen fires the thrusters.