I enjoyed several parts of this story, and in particular the bit where the narrator got confused between himself as a former person and himself as a former tree. I liked the rope creaking for mood, but I think the foghorn was a little distracting; it kept popping up in the loop and drowning out a word or two in the quiet bits. There was one moment when the narrator mentions the foghorns, and the sound appeared right afterward, and that was nice, but I think it could otherwise have been clipped out to profitable effect.
A little less foghorn would have made this perfect for me. I loved the lower rumbling horn that also sounds like horns that trains use.
I dug the story. The end of the world relayed by someone who can't see is a really fascinating concept. And we get to say Shoggoth In A Box. And I enjoy good use of Lovecraft's mythos just like I enjoy good use of vampires and zombies. To the rest of you, better luck next week!