That was fun!
In the beginning I found the lack of collisions between objects as a curse, but that is a blessing after all. I can't imagine not being able to put a book inside a book now!
Clean visuals help to focus on decluttering. A gentle bell confirming I'm doing the right thing is also good, yet I would appreciate some visual confirmation too.
It was a captivating experience till the very end, thanks to intensifying cattiness. I wish for a proper ending (is it possible though, having full shelves of pillows?), the one you have feels a bit abrupt.