For $1, worth it. No real reason not to get it if you like 3D platforming. I especially like how fast-paced it can be once you get good enough at it.
From what I read, it was originally part of a "haunted games" type anthology? There are horror elements that appear as the game goes on, and I think they're more impactful with the game removed from the anthology context. The scary stuff is more unexpected that way. That said, the theming doesn't really lead to anything. It mostly uses the horror elements to remix the stages. I would have liked to see it lead to something more, but again, the game is only $1.