This is really well made. The very small cast and the desolation of the setting makes this claustrophobic, even though it is set in the great wide outdoors. The unexplained nature of the threat makes it far more dangerous than if it was a creature you could see in the darkness somewhere. The twist is earned and the ending feels impactful. This is a very good example of how to do a movie like this right and I'm very happy that I got to see it.