I've come back to this a couple of times before commenting.
I'm a massive fan of 1:1 crops having ran a Mamiya C330f system for a good number of my formative years and today I look for and shoot square on a regular basis. I get the feeling you shot this wonderful scene but only decided to crop it when you got home and so (for me) doesn't quite work. Square images need to be seen and composed in camera and need a very balanced feel to their composition like a very strong central subject or clear symmetry to have maximum impact. It is in no way a poor shot, its well exposed, naturally processed and has plenty of interest within it for the viewer to explore but I feel lacks a certain impact.