This is very well put together! I got the normal ending, but I'm missing one of the items (the one you place on the far right in the area past the cat door). I'm completely stumped.
Hello! Thank for for your feedback (and please ignore that deleted post: I realized I gave for the wrong information).
I'm currently working on a walkthrough on the YNFG Wikia, but until then, you can find the Spray Can back in the Cheshire Forest. The entrance to the place you're looking for should be slightly north and to the left, and you'll need an effect to get in.
Hope that helps!