This is a god tier game and I've finished it countless times in almost every patch. Is there any chance you could add an additional difficulty mode where prestige points aren't gained for mountains where you've already gained them? So you would need to make more progress to get more PPs. The mountains would have to be buffed as well.
Another thing that I would love to have in the future is a way to lose. Perhaps the mountain and its denizens could start fighting back against the buildings or something.
Again, insanely good game. I hope you can add more challenges so I can keep playing it over and over again.