I think this is very creative and meets the challenge well. I don't usually like selective desats, but this is a rare exception because it adds to the image.
I like the HDR affect, I think you've really pulled out some details.
I agree with some of the comments about the busy background, it's almost hard to look at. I think a tighter crop would have increased your score by a point.
Exposure on the mirrored part of the scene is gorgeous and I love the starburst of light. Think I might prefer more of the left side of the image cropped out ... just not adding enough interest for there to be so much of it.