How about a campaign mode?
I would love a story telling campaign mode. The games seems fun, it reminds me of a game I played in primary school (Cesar 3). The endless building game mode is fun but my favorite part was the campaign where you were given various tasks of increasing difficulty. The campaign acted as a tutorial while also telling me a story of the Roman empire. Even now 20+ later I remember some of the missions. I would love to see something similar and the story could be for you to slowly discover what happened to the humans.