This movie changes from a psychological drama about isolation to a full-on survivor horror movie and to then pivot into a near cosmic horror story at the very end. It is an interesting transition and one that not many movies could pull off. This one does it because you are invested in the characters and they are so well acted and so well directed that the premise actualizes them rather than diminish them. The adversarial conditions that the characters are placed in are positioned in the story very well and are given enough good effects so that they become quite terrifying. It is not a movie for the ages possibly, but it is certainly good enough to give it a watch.