A really cool mechanic would be if you were able to set leaders for certain areas of the map. The leaders could start constructions other than just houses, such as hospitals or resource gathering buildings. This would be nice as if you have multiple planets with multiple cities it would take off the burden of constantly micro managing every single city.
I also think it wold be really cool if your nuggets would have an opinion of you, and depending on how you treat them they will change their own opinion and actions. like maybe your a wrathful god whom demands sacrifices or els their will be plague. Having such a religion aspect would be interesting and add diversity to the game.
so far the frame work you have laid out is really good, this game has a vast potential and i cant wait for future updates.