Thank God it's not just me...
I just finished this film, and I really thought I missed something crucial that left me in the dark as the credits rolled. I consider myself fairly well-versed in cinema; I have an appreciation for deliberately paced films, as well. I don't even need movies spoon-fed to me. In fact, I was quite enjoying it until the film just up an ran away from me.
So I love imdb right now because I see I am not alone. Usually for particularly dense or avant-garde films, the boards abound with theories and explanations, but I don't see a single one here. So that leads me to tend to believe that it isn't us. I'm not going to come right out and say that the writer and director ran out of ideas, so they tried to come up with an ending that would be open ended and cause a buzz, but it's crossing my mind.
Right now I cannot give this movie more than a 5/10, but if I have an epiphany and "get" the ending, I may adjust my vote.