Matthew Bowers’s review published on Letterboxd :
Fantastic! The ending suffers from Sherlock Holmes (or Harry Potter, if you prefer) syndrome, and the film would have been better served if Dr. Barrett's theories had been presented up front, as they are in the book, but the acting is surprisingly strong and the cinematography and direction are fantastic. A wide variety of dutch angles, distorted lenses, split focus, and other optical effects are used to great effect. I enjoyed the hell out of this one, no pun intended.