this is awesome! :D i've always wanted a game where i can just build for fun, and this is definitely it. i can't imagine how cool it'll be once it's complete. i love the concepts you plan to add, especially more objects and more character interactions. i'll be following your progress, can't wait for the full release.
just some feedback - i saw someone else commented about the process of deleting items, and i'd just like to add that i agree. it's a bit sad to have to delete lots of things to remove a single item. maybe if there was some sort of eraser tool? that way the ui could still be very simple.
i hope you don't mind the feedback, and again the game is so good!! i played for ages without getting bored. good luck with the rest of the development :D