Though it may not be as true today, in the 1980s you could almost always count on a Lucasfilm game (or Epyx game for that matter) to be of high quality. Rescue on Fractalus is no exception. It was initially developed for the Atari 8-bit line of computers and later ported to other popular computers such as the Commodore 64, Apple II and even the Tandy Color Computer 3 (a rare high profile 3rd party title for that system).
In Rescue on Fractalus, you pilot a spaceship through mountainous terrain looking for downed pilots to rescue. Once found, you must land close enough so that the downed pilot can make it to your ship before dying in the acidic atmosphere. To make matters more difficult, aliens take pot shots at you during you search. In addition, they will sometimes impersonate downed pilots in an attempt to get aboard your ship.
This is definitely a challenging game but one that is well worth playing. Both the Atari 8-bit and Commodore 64 versions are good and are easy enough to find for emulation purposes if you can't track down an original (or don't have the equipment). This game would make for a great modern remake but alas there have been none.
A strategy guide and a little bit more info about the game can be found here: https://www.megalextoria.com/wordpress/index.php/2017/03/15/rescue-on-fractulus-atari-xe-strategy/
