It's a film that obviously wants you to think about it, but not a story which bears close scrutiny. There's barely a story, honestly, the film is 98% atmosphere and timbre. The way that he's set up and three distinct, concurrent versions of the movie within itself is great. A structural feat. But there are nodes, there are going to be intersections, there have to be intersections, where one version must be favored over another.
Ultimately, take a movie like Primer. One the first viewing of that movie it is largely incomprehensible. You need a flowchart to understand the plot but it is ultimately comprehensible. That is a also a real feat of structure, that structure mimicing the subject matter. With this one... and it's because of three scenes where those story nodes happened and he refused to favor... ultimately it's incomprehensible. "Chaos is understanding unordered" is a very good opening quote, but he failed to meet that obligation.
If the final scene had ended in anything except a sigh... I'd actually be insulted. But it makes me think that he's aware that this is, ultimately, indulgent gibberish. And I'm sure the spider-bodysnatcher theory has got to be one of his favorites.
You wait that entire movie for that sigh. The movie ends with a jump scare. That's fucking wonderful.
But I can't imagine watching it again. Ultimately it's just hollow. But then again, he's painting the picture of a hollow man. I guess that's how he manages to turn what would otherwise be extreme weakness into an advantage.