Thanks for adding the game to your collection, Im honored. I would want the buildings more sci-fi as its in a future date when humans settle on mars and in dome-like greenhouse structures begin to terraform the planet. So Artificial vegetarion perhaps in some aided capsule or dome like structures while the outside can be mostly arid. Also the atmosphere might have radiation so the architecture might need some kind of metalic or glass like finish to protect the humans living inside. The totalitarian rulers could have also built pyramid like structures as it has some conection to astrology and sulernatural power (Egypts pyramids are mysteriosly made) although they would probably use metals, glass maybe even refined man-madr materials like plastic or rubber to combat the radiation. Lastly Mars is very cold, like -64 C or at best -4 C.
Thank you so much, and Im completly open to your own artistic expression however you want.