Amazing!
The opening shot was excellent and the flash was solid throughout. You definitely nailed the whole atmospheric vibe as well as great use of cinematography. I noticed while watching it that the shots outside the shack are fullscreen whereas the interior shots are smaller to literally create a sense of being trapped and isolated, a great touch. One thing I admire about the flash as well is that it's very long but still keeps the audience on edge, it must have been about 8 minutes long but I enjoyed all of it.
The only thing I was a bit hesitant about was the ending, I was a little confused about that. But nether-the-less, brilliant work!