This may sound weird, but I would like to see more end game house upgrades with small rooms. I personally think that 6x6 is a bit too big already and the last house upgrade has two 8x8 rooms. Upgrading the size of a room a few times is nice, but it can quickly became so big that decorating it becomes difficult because everything looks so small in it. It would be neat if there were house upgrades with maybe 3-4 rooms, but with smaller size. That way people who are into interior decoration would also have an easier time creating differently themed rooms instead of being stuck with only two. More house upgrades to pick from would also be a great way to personalize the game, as people could pick between having more pets or more pumpkin slots or more rooms, etc.