What makes it different from others?

It's hard to see any effort in the film. There's no comedy to speak of, no real drama and, worst of all.

It's funny, it's tense, it features two great performances from two actors and the director expertly creates a web of odd tension where you actually don't know what is happening for the majority of the run time.

All of these films share one commonality, that being a kind of emotional center that humanizes a cast of monsters.