It is the perfect example of a director having a few actors, no money, and an idea. It does so much with so little. It gets into insane mind bending territory in the 2nd and 3rd act, and it honestly one of the smartest films I've seen. The ending, without giving away spoilers, is one of the best endings I've ever seen. It is the perfect example of leaving it on a cliffhanger, without making your audience feel cheated that they couldn't see what happens next.
I'm curious if anyone else has seen this film and what they thought of it. I know I like it way more than most people, but I'm wanting to get others opinion on it.