LOL! I read this last night! (Saw the same forum post and decided to update the GCD's info.)
I wouldn't call it Teen reading, it seemed aimed at Children instead. While it does have a certain charm the aimed at children aspect was kind of a drawback to me as I'm not a child and what might have entertained me then doesn't now.
That being said, if you overlook the simplicity and repetition, it's a nicely drawn, feel good book.
I'd have preferred if Millie could talk so we could have gotten more of her personality direct, but eh, minor quibble.
Part of me was thinking, "Poor, Bill Woggon. For years he drew the attractive Katy Keene, now he's drawing a monster in a dress."
Probably best if you can channel your inner child while reading it.