I would go ahead and say this qualifies as a great puzzle. I'm a big fan of the way you used turrets as soft, easy warm-ups for the big puzzle tasks and the way they flowed naturally into the problem solving. It never felt too overwhelming. There were, however, two big issues I noticed that I think you definitely want to address.
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I understand you don't want to give everything away totally with your lighting, and that this is a pretty darkly lit theme you're going for, but this wall was simply too poorly lit IMO.
The other major issue I had, was that the very first switch in the map, I was able to strafe jump along the wall to reach it rather than actually solving the puzzle. This is a really bad design IMO because you don't want to tempt players to play things incorrectly, you want them to be totally focused on the "real" solution rather than wasting time with what are essentially exploits.
Overall, really high marks. I think the music could be altered as you progress through the puzzle for extra sense of reward and satisfaction. Really nice!