The story is cute, but what really makes this book memorable are a) the illustrations and b) the read-out-loud-ability of it all. i don't think I've seen picture book illustrations that convey such a cozy autumn atmosphere as this one. The paintings are adorable, but also a bit sly and humorous - full of details that children can and will savor and pore over again and again. The text is energetic and engaging and I think will be enjoyed by most children.
In truth this is really not strictly a Halloween book, but with its autumn and pumpkin themes it is best to read around late October.