Loved it. Brilliant. A bit of a slow start - I faded in and out a little - but by the end, as things became clear, I gave rapt attention. Wonderful ending line, BTW - absolutely classic.
This was actual horror. Made your skin crawl. Evoked both dread and fear - permeated with utter hopelessness. Stories like these are the meat and potatoes of the genre: the ones that make the rare few which shine a little light seem all the brighter. Brilliant. Much praise to both the author and to the narrator.