Splendid...
And to think I thought I had forgotten my childhood...
Aww, now that was very cute. It indeed brought a smile to my face at the happy ending. But what I really liked was the child-like simplicity of it all. I mean, this monster is not very startling to begin with, but, in an almost odd sort of way, we fall in love with him, loving his sad state which is caused by his inability to scare the least of anybody. In the end the simplest, most basic, and most primitive moral of all is made, which brings joy to our minds, as the monster's odd predicament is solved.
In addition to that, what REALLY made it feel child-like (And trust me I mean that in a GOOD way) were both the cranyons (and their simplestic drawings - oh, the nostalgia of it all!) and the beautiful, toy-like music.
In the end, this is a great work of art, composed by an aurthur who he himself brings us back to a place where we all have been - childhood.