I love the idea! And the monkey is pretty cute
Slight movement adjustment would be nice so the monkey doesn't feel as slippery, it's especially hard to control during platforming and last level. Also, when I'm trying to put down the box it was a bit hard to tell which direction I'm going to put it down to- the only indication of where I'm facing is the tail. Perhaps try to make a side box holding profile instead of front.
I actually like the puzzles, they're simple enough but also fun to do!
That ghost is lying when he said he'll help out, his friends certainly burned me! :0