Yes, I also wasn't sure where the movie was heading, but I didn't mind it at all. From the first moment on it had a firm grip on me because of the eerie atmosphere, intriguing takeoff and beautiful cinematography (a joy for the senses and the stomach to NOT have to endure the documetary style restless camera. A pitty the wonderful engaging steady cam is mostly found in horror/thriller. Longing to see more of it in other genres too.)
There was a moment I felt a little annoyed by the girl because she didn't seem able to change her expression. Or say anything sensible at all. Was ready to dislike the actress (Barden) but all became clear in the end and her character was really, REALLY very troubled so the apathy turned out to be good acting. Thank goodness.
What really surprised me was that it started rather unearthy, morphed into quite chilling, but ended up as a deeply sad and strangely comforting movie.
Very nice.