First off, congrats on the nice score and high placement.
Initial Impression - It appears to be a study of color and a very good one at that. Most of the colors sit on the same side of the color wheel and compliment each very well. A stunning photograph.
Composition - The centered composition works well for this photography, mainly because of the two firework anchors you have on either side. The symmetry works smoothly. The horizontal fireworks all give the photo nice breadth. I slightly notice a slight dip to the lower right in the horizon, not a big deal but worth mentioning. You might try and see if cropping an 1/8 off the bottom helps bring more emphasis to the photo. I don't feel the bottom is bringing anything to the composition.
Technique - Exposure is execellent. The fireworks have a nice contrast against the dark background. Not sure if this was done in post or taken ala naturale, but it is seemless nonetheless. I notice jagged edges to the photo, not sure if it was from a severe crop or more likely an anti-aliasing issue at this point. I doubt it shows up in the original so it is more of a minor critique.
Overall: It is a terrific photo. Considering the long exposure it is even more impressive. Great work with the colors and setting up the frame. A job well done.
Well this is not bad at all but the "neon" coloring is not really to my taste, did you bump the saturation here way up? Also, the dark foreground is too dark for my taste, a little more going on there would have gotten a higher score from me. 5