This felt like a strange mish-mash of indie drama, psychological terror, and cult horror: the atmosphere is unsettling throughout, with the party interspersed with flashbacks to how a couple’s idyllic life came unraveled and hints at how one half of the couple has found a strange and dangerous way to cope. There’s a philosophical undercurrent of how we can and should deal with pain and trauma, and a frightening reductio-ad-absurdum on putting creatures out of their misery. The ending scene is subtle and frightening.
Overall, I enjoyed this movie; it’s a strange hybrid, neither horror nor drama, but it succeeds on its own terms.