Each main installment of the Little Match Girl series has introduced some new and interesting mechanic, and this installment's is (Spoiler - click to show)Linus's skeleton key for Part 1, and (Spoiler - click to show)controlling the five Ebenezabeths for Part 2. The former is a novel approach to this series's core concept, but the latter is unlike anything I've seen in IF games before.
The narrative of Hunter's Vow has also improved upon it predecessors, giving players a protagonist other than Ebenezabeth, showing (Spoiler - click to show)Ebenezabeth at various points in her life, and several fun characters from and references to previous games in the series.
Fun game, definitely worth playing!