Coraline by Neil Gaiman — Gaiman's other middle-grade masterpiece featuring a brave child protagonist facing supernatural dangers with similar atmospheric tone.
The Phantom Tollbooth by Norton Juster — Episodic adventures of a young protagonist in a fantastical world, combining whimsy with deeper themes about growing up.
A Monster Calls by Patrick Ness — Explores death and grief through a young boy's supernatural encounters, with similar emotional depth and beautiful prose.