I could appreciate the subtle tension that's simmering under the surface almost from start to finish - there's some good acting in this one, and some good camerawork as well.
Unfortunately, as already pointed out, there isn't really _one_ story here, and none of those that are woven into the movie has enough substance to it to stand on its own feet. Which might be the reason why they got so chopped up and haphazardly glued together in such a random sequence to make the final roll of film that is the completed movie. But with all that, it just ended up presenting the chronology of events in a way that's hard to follow. In a story like this, I'd argue it would/should be one of the most vital things to keep track of, and it's exactly what gets lost here.
Not to mention the primary part, or what seemingly is the intended primary part the movie is built on... [spoiler]ultimately isn't a key, or even much of a significant element of the whole.[/spoiler]