My deam game is something like a Harvest Moon/Stardew Valley meets Fallout 4 settlements. It's a 2D pixelated farming game but in post-apocalyptical world, where you must protect your farm from zombies, mutants and bad people out there, grow crops, feed your group and reconstruct the city. If you don't, the NPC's and your party members/family may actually die from starvation or disease or maybe cold in winter (like it happens to your family in papers please if you don't bring enough money) daily_). I just love farming games and Fallout settlements and I think the apocalypse would spice things up. ;D