Critics from PopHorror and other outlets praised the raw chemistry between Stefanie Scott and Isabelle Fuhrman.

“There are cracks in the icy mood of this austere, slow-paced horror.” Rotten Tomatoes

The film is visually striking, using naturalistic candlelight and a palette of grays and browns to create an oppressive, "you-are-there" feeling.

Reviewers generally found the film's mood exceptional but were divided on its pacing and narrative clarity.

“The Last Thing Mary Saw is so effective as a vehicle for performances, atmosphere, and period detail... that one may wish that it added up to more.” Roger Ebert · 4 years ago The Last Thing Mary Saw (2021) - IMDb

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