My first instinct is to say a reprint of the original Ghostbusters role-playing game, preferably with an accompanying booklet that condenses the rules (and offers a binary randomizer option similar to that used in Prince Valiant) and higher quality equipment cards (with an emphasis on durability).
Otherwise, I would like to see a Flash Gordon, Buck Rogers, or Barbarella game based on the Prince Valiant rules system.
A Fudge or Sherpa conversion of Timeship would also be welcome (especially if I am hired to convert it).
[For more information on #RPGaDAY (or #RPGaDAY2017 specifically), read this. Other installments from my own participation may be found here.]
