Kinda depends how different a game can be while still being considered “similar”. Vae Victis has some similar elements, with a male lead who doesn’t take anybody’s shit and goes around taking women for his harem, with some interesting worldbuilding; but, while it does have desert areas, it doesn’t take place exclusively in such a location, and the setting is fantastical as opposed to postapocalyptic.
To be honest, I’m also on the lookout for recommendations like these, if anyone has any. My criteria extend to what I said above: man in charge, gets himself a harem. (Good writing and worldbuilding are always a plus.)