: Critics have hailed the film as a bold reinvention of the found footage subgenre, using a webcam-based framing to build a surreal, harrowing suspense.
: Casey (played by Anna Cobb) decides to take the "World's Fair Challenge," a viral online horror game that supposedly causes physical and psychological changes in its players. As she documents her "symptoms" through a series of vlogs, the line between her reality and the online game begins to blur.
: Beyond the horror, the film is an accurate depiction of modern teenage isolation. Schoenbrun, who is non-binary, has noted that the film was inspired by their own coming-out process and explores deep themes of gender dysphoria.