Building on the first user review "I suspect fraud," I too suspect fraud. When I purchased it from Amazon Prime on demand, I too did so based on an extremely high IMDb rating - 8.4 in this case.
Almost as soon as I started watching it, I realized something was wrong. I asked my intellectual, millennial son to start watching with me on the chance that the movie was meant to be ironic, - so bad that it would actually be funny. It was not. We struggled to keep with it for about half the movie but gave up. I thought perhaps the high score was due to there being only a few ratings. I was later surprised to find 90 ratings on IMDb but only the one review.
I don't know all the terminology of professionally made movies, but the sound (much echo), cinematography, editing, transitions, - everything was terrible. I might say it had the quality one might expect from a college film project but that would be too harsh to college film students.
I don't know who these actors are (the description touts them as an "international cast"), but to a person, the acting was terrible. I would agree with "wooden" as the other review labeled it.
My favorite line: the psychiatrist takes the five patients to a massive, historical stone fortress that is the same as the one in each of their dreams. One patient exclaims: "It's exactly the same. Did you have them build it?"
I don't need my money back; I'll chalk it up as an experience. It prompted me to write my first IMDb review so I'll settle for the feeling of self-righteous satisfaction in warning off others smart enough to look at IMDb before renting the movie.