From what I can determine, you are on a space station and are awakened because it is being attacked by space beings. You have 999 seconds to save your station. There are 3 of you (hence 3 lives). The aliens attack in waves, eating through the station wall. Fortunately, you are wearing a space suit. There are elevators that you can use to get to various levels. You can change the direction (up or down) by a switch next to the elevator.
[source:mobygames]
Distribution : Retail - CommercialPlatform(s) : Commodore 64
Links