One of the few movies that gets better after the credits roll
I don't mean when the credits are done rolling, but when the first credits appear. It's subtle, but it actually adds to the film. It's not some gratuitous Marvel roll credits shot. It works within the story, makes sense, and is generally creepy.
Overall, I thought the film was oh-so-close to greatness, but just missed out on it. It was scary, but seemed to squash a lot of the scares in some sort of sabotage way. But I have to give it credit for being original, interesting, and fresh.