So with OD&D being the basis for several games out there surely there isn't a free low level adventure that could be used introduce your old school space scum to some back water planet? Well there actually is a very well done one for the Basic Fantasy Rpg and its free.
With the Mandolorian hitting hard on the nostalgia buttons its not hard to see where & when this style of high space adventure could hit an OSR campaign note! All of this campaign formula is completely compatible with Warriors of the Red Planet or Dungeons & Dragons Warriors of Mars
Boil all of this in hot simmering pot of White Star & your ready to go with only players needed to be added into the kitchen soup of a mix. Giving the DM a complete run of everything they need for OSR interstellar adventure!