It's a good movie.
Watching it felt like a cross between Ryan Reynolds' Buried (2010) and a lead similar to the one in DeadStream (2022), but with a Sufi twist.
The film gives a good visual portrayal of the Sufi practice of dhikr al-mawt-the remembrance of death-which are described in the works of al-Ghazali.
Some Sufi orders still engage in this exercise, not always in practice but in spirit (no pun intended): visualising themselves lying in the grave as a way coming to terms with their mortality and end their attachments with the world.
I feel some conservative folk may take issue with the practice of lying in a grave, saying: "Why retreat into a grave? Retreat to the mountains like the Prophets before us did." To them, and I ain't no Sufi, I say: take this film for what it is-a window into the intention of some Sufi orders.