I love this little sandbox! Been playing around it for hours.
Here is a brainstorming list of ideas off the top of my head. No pressure to implement any of them, I just wanted to write them down, and share a potential vision of what the game could evolve to be. If you like any of them, by any means, steal it :D
-Lamps, lantern posts and lighting, day/night cycle (slider)
-Flower beds, farmland with crops
-Fence gates (when a path goes through a fence)
-Stairs and ladders should be stack-able
-Water on higher elevations + waterfalls
-Larger maps and more height?
-Stone buildings (for 1st floor, and castles)
-Clock / bell towers?
-Windmills and watermills (some hidden/convoluted way to make them with regular pieces?)
-Connected bookshelves (+hidden bookshelf doors if there is a door behind a bookshelf). Connecting barrels or log piles could connect them to make bigger stacks too.
-Trapdoors on ladder hatches
-Let us delete floors between storeys, to create buildings with higher ceilings (like churches) and indoor balconies.
-Birds flying and landing on the roofs, and chirping (owls during the night)
-Water wells