I only recently found OPR, and I've been focused on AoF, so excuse my ignorance; are Saurians in space a faction in GF?
Okay, that aside, I found Brek'thar an interesting character, and the story was pretty engaging. My one major issue was Brek'thar/Brek. There didn't seem to be any rhyme or reason for choosing to use his formal name versus his shortened name. It's important to stick to one for flow and consistency, so you can emphasize when you swap between them.
Take Sam from LotR as an example. Samwise Gamgee. You know this is his full name from very early on, but probably 90% of the time, they call him Sam. Mostly on account of it being shorter, I'd imagine, as well as being the name he preferred. Tolkien only referred to him as Samwise when he was in trouble, when he was being shown reverence, such as by Faramir, who only ever calls him Samwise, and I believe in reference to his loyalty. Been a bit since I've read LotR, but I hope that explains what I mean.
Oh! And just one thought about the ending. Take it or leave it. I think you'd have a more decisive end without the "It was over" sentence. Try removing it and reading it without and see what you think!