This is one of those maps where a 1 dimensional rating is always going to be unfair to the work in question.
*Aesthetically* and *tonally*, this is a great map - it feels oppressive and constraining, being trapped in a dark mechanism. The moving walls are great, and generally the mapper's self-imposed constraints are turned into a positive.
However, this inherently also means that it's not always the best experience to play - as others have noted, the darkness sometimes gets in the way (I fell off ledges a lot just because I couldn't quite judge where the end was), and some of the constrained geometry means that it's often easy to be in a location where you can't effectively dodge (the many scrags in the map make this a problem).
On skill 0, I got ~25% of the way through the map (kills-wise), having died more than 10 times (mostly to scrags), and hopelessly lost as to where to go because all the dark ledges basically look alike.
Which, yes, is tremendously thematically appropriate... but also perhaps a problem.