Chris Eggertsen included the film as number seven in a countdown of the "Top Ten Underrated Horror Gems", citing its "excellent cinematography and deft use of color", though criticizing its "poor use of dubbing". The dubbing is, indeed, a bit of a problem, but that is more or less standard with these things. Often, if I understand correctly, they do not even have an audio track to begin with and dub everything later regardless of language.
The film works great as a giallo. The general concept is usually someone thinks they see something, but is not quite sure, and then they have to investigate it. This works on those lines, but the "seeing" is a psychic vision, not quite accurate. A gallery is mistaken for a museum, a man with a beard has shaved, and so on.