There is no Atari 8-bit cover art on file for this game
Lunar Leepers - Apple II title
If you approach a hostage while a leeper is nearby, the leeper will keep walking toward them until they are killed. If you are grabbed by a leeper, you lose a life. You can shoot at the leepers, but the catch is that you cannot shoot at them while they are on the surface, and you have limited ammo. You also have limited fuel, and if you are half-empty, you must refill at the gas depot in order to continue.
In between levels, you enter a cavern where you must find a huge floating object. You must then shoot out its core to proceed to the next difficult level.