I guess it is long for a novella, but short for a novel. That means there is not a lot of room to build up characters. The protagonist is a bookish but uncomplicated boy but e.g. the parents are mostly ciphers.
It's an engaging story, I finished it in a few sessions, something I don't do very often these days. It feel very English, and very Rural, which isn't what I remember of Gaiman. It doesn't really break any new ground, but it well crafted, and the setting is more completely related than the characters.
It does have some scenes that would probably give sensitive souls (and children) nightmares.