Absolutely fantastic! You've made wonderful use of the limited resolution - I found myself constantly second guessing if something in the environment was actually moving or if it was just my imagination interpreting the way the world was rendered.
I loved the smash cuts at the end of each day - the sudden cut in audio feels so unnatural after the birdsong and really works well to throw me off balance.
Of course, the night scene is the standout, building the tension wonderfully and drawing it out just long enough to be really unsettling.
Thoroughly enjoyed this, will be playing again soon to find the second ending :)