The concept of 'square' here is very strong. Your image also drew me in to make me look and think :) I played with the puzzle in my mind but I can't make it work out in my head :)
I like the color in the image as well.. the strong colors are always nice. I wouldn't change anything compositionally here either.
I don't really know why this shot didn't score a little higher. It is an interesting photo. The comments you received don't seem to indicate much negativity either. Maybe it's posslble that the 'novelty' concept of the photograph did not create much impact for the viewer. The 'artistic' value of the photo may not have the "i want to hang this on my wall' factor.