I absolutely loved this. Strong writing is increasingly rare to come by. So, when I see it, oh baby. I am in. And the audio! Foreboding. Squishy.
What feedback I do have mirrors what BC said. The scanline(?) effects led to some squinting, even in full screen. I also agree that the creature encounters take away from that part of it, many times I had to read from the beginning after being distracted by The Creature and go "wait, where was I?" I think this is generally a symptom of frequency - by having said Creature be so frequent (and honestly easy to take care of) the horror factor quickly vanishes. I don't know if this is intentional, but if the creature appears when looking at the map, I was stuck at the map. I could still take care of the creature, and doing so felt very powerful.
Not for nothing, I have never played anything like this before. And I mean that in the best way possible. Played all the way through, got the eagle, had a blast. Great work!