I like the idea behind this shot - in many ways perhaps the most imaginitive I've seen from this challenge: just take a normal image, and adjust out until you have two secondary colours - it's added interest to what would perhaps be a pretty ordinary scene whilst sticking completely to the challenge.
Whilst 5.5 is an acceptable score in my eyes, and 63rd a pretty good placing, I think it's the original shot rather than the processing that has kept the score down, and I think the problem with that shot is the composition - there are no verticals here at all, nothing really to disturb the horizontal lines other than the points of streetlighting. The cloud pattern is interesting, but not very interesting, and the reflections in the water likewise. I think perhaps also the horizon is set too low - that top area of sky doesn't really add a great deal to the image. I'd like to have seen it cropped or framed much closer in to the town, to let some real detail come out - you could even have made a feature of the progression from water to town to sky in a portrait composition, which would have been quite striking.
Interesting shot though - and a top idea. With a really dynamic base image you could have been in ribbon territory I think.
Beautiful. Nice idea and perfect coloring for the challenge. I rate this a 9 because I would like to see the city/lights maybe closer and more in focus. Nice work.