Kamurai
Really good watch, could watch again, and can recommend.
This is no "Day 5" (A Rooster Teeth series where people who fall asleep never wake again). This is more like a twisted opposite of that, but still interesting. Watching characters slowly go insane has a certain level of appeal to it when it comes to stories. It's an onboard clock to how far the story can be pushed.
The cast does a great job of leaning into the characters and their situations, the story itself is decent, but does lean quite a bit on the concept alone.
The movie distracts from it's main plot from being about a mom and her two kids, this creates dependencies that wouldn't usually exist in apocalyptic survivor groups. It allows for some predictability as well...