I've like all of his books so far, but this is definitely one of my favorites. He describes the book perfectly in the postscript:

"So, I knew this book would have one foot in a whimsical space. I didn’t want a fairy tale, but I wanted something adjacent. However, I also didn’t want it to be too childlike. I wanted something my fans would enjoy: a grown-up fairy tale, so to speak."

And enjoy it I did. Aside from the story it has cute illustrations, very lovable characters and clever spins on fantasy tropes. It contains many references to the cosmere so it might not be good starting point for his books, unless you're good at ignoring those hints!