This is very nicely done. Your use of lightbricks, which I consider to be some of the most annoying and hard to work with lego pieces ever, is impressive. Also I liked your space marines. Actually reminded me personally of a cadre squad like out of David Weber's In Fury Born. Very cool.
Nice vignette and I knew those "Galaxy Patrol" figs similar to Space Marines when I first saw them. All we need are some Chaos emblem stickers for the marines and we got ourselves a brutal war. I also like the use of those light bricks to make it more realistic.
This is one of the best vignettes I've seen. I love the colors you've used and those outfits you have on your figs are awesome. What set did those come out of? Your use of the piping looks great and some very well placed light-up bricks. Nicely done.