Dynamic citizens – leave homes at dawn → work → shops → back home; travel time based on road path-finding you place.
Economy loop – factories make goods (and may lose 1 worker / hr), shops sell goods / earn money.
Power plants – radius overlay; factories inside produce more, shops earn +50 %.
Farms – fields must be inside the farm radius; with enough farmers they can spawn new residents.
Rivers & bridges – rivers are procedurally generated; build bridges to connect districts.

https://sgradegames.itch.io/pico-city-builder