 Dennis Harvey of "Variety" called it a "taut, yet often slyly funny scarefest", though he said the climax is unfulfilling.Though he praised the acting, Stephen Dalton of "The Hollywood Reporter" called the film an "unsatisfactory compromise" of art-house and exploitation film.Richard Whittaker of "The Austin Chronicle" wrote that Øvredal "constructs a sinister claustrophobia", then "elegantly and disturbingly unwraps the enigma".