It's hard for me to imagine how it would adapt to screen, since it's a) short and b) unmemorable. The original story might possibly maybe kinda sorta fall very loosely into the category of horror, but it's more in the unpopular and vaguely-defined realm of metaphysical sci-fi. It could probably make a mediocre short subject, but a feature-length film?
I'm a little curious, but my interest is diminished somewhat by the reviews on Amazon, which are some of the most universally negative I've ever seen. Just to hammer the point home, Amazon users have described it with the following tags:
For the purpose of comparison, Re-Animator is the best Lovecraft adaptation I've ever seen (which is not to say that it's a great movie), and it's tagged with best horror 100 2005, cult film, zombie movie, lovecraft movie, and feel good horror, the latter of which explains why I always feel so much life affirmation during the disembodied-head-giving-head scene.
And here I've spent years thinking I was a maladjusted freak.