I would be interested in seeing some screenshots of historical gameplay if you know of a place that might have them.
The #galactic-milieu topic on the HIVE blockchain has some screen-grabs: https://peakd.com/created/galactic-milieu
Battle for Wesnoth is a free open-source game that operates kind of like the ancient education programs or read-your-own-adventure novels in which your choices determine what you are shown next, with set piece battles or adventures as one of the forms of decision choices as in did you win or not basically; a game in which you re-play history but if you fail at any step to accomplish what the historical protagonists did you usually just lose the game; that has been used to make sort of historical docu-dramas about some of the "temporal nexi" in the game even though BfW didn't end up actually adding yet the kind of features that had been discussed for it that would have led to its being useful for actually deciding what actually happened.
The plan in saving each FreeCiv-turn's savegame files is that someday if Wesnoth adds the features that don't seem anymore even maybe to be in its roadmap it might be possible to use it as one of the methods Time Cadets could use to re-visit a temporal nexus (read: FreeCiv savegame) and branch an alternate history off of it.
The Between the Worlds campaign is a portmanteau with a few different threads in it which include a Time Cadet storyline as well as a Space Cadet storyline. The Devtome wiki has pages about some other campaigns also.
The idea is that the Milieu agents introduced the Battle for Wesnoth software to Earth as part of its preparing the planet to join the Milieu, as a software tool allowing Earth to begin early stages of training Holodocudrama developers well ahead of introducing actual holodecks / holobarracks which are of course a too advanced technology for such a backward planet at this time. But like a holodrama Wesnoth software lets one set up educational storyboards / storylines which include interactive elements.
The campaigns do typically include some screengrabs from for example FreeCiv and Crossfire-RPG.
It is possible the Milieu stuff on Quora might have some screengrabs too.
-MarkM-