You should add some enemies to the game, like raiders trying to steal your food, kill your people, and vandalize your pyramid. I think that would give a decent challenge to where the player has to train warriors to defend and infiltrate raider camps to convert them to slaves (aka your population)
I feel that it would bring more of a challenge to the game and (possibly) improve it
I really enjoyed this game and i hope it grows in the future.
Keep pushing on!