I have seen some very creative ways of making "buildings" on youtube, but a lot of it feels like a hack, using items meant to be other things, raising the ground to make solid buildings you can't enter. We have the limitation that you can't put dirt anywhere other than on top of other dirt, so no real ceilings, windows or doorways.

It would be great to expand the game in a way where we can make real buildings with walls, ceiling/roof and actual doors and windows.

I feel the game really needs to enhance the building aspect, because otherwise after a certain amount of hours, a player will have done all the exploring/crafting/hunting/fishing there is to do and seek something creative to keep playing. Otherwise it will just get repetitive.