What a good and fun game! I haven't had little fun like this in a while. I find it a little odd that some last elements became rainbow colored, specially ones that I checked before and weren't scalable!
I also notice that some small and precise elements like the book in the book shelf have a hard time getting into place unless the whole shelf holding them is in a bigger scale (namely the red book and scroll on the bottom conflicting each other).
Great game!