Not bad, not bad at all. Believe it or not, that is better done than some fully-released campaigns out there (Technological Superiority comes to mind). Please stop reminding us that you're 11, cause this is quite a good first mission. What gave you the idea that it was a BoE mission anyway? I've seen missions with
many more capital ships than that, this one was quite well-balanced.
Gripes are minor, but there are some:
-No background. More trivial than most, the lack of background just means that the mission space looks blank, maybe putting a planet and moon nearby would help?
-Advice on weapons: If people are gonna be downloading new missions to try out, they will likely have a pretty good idea of what weapons do. Might remove that line of the briefing suggesting which guns to use. I beat it with dual Prometheus S's (I hate Maxim Guns

).
-Crowded: The battlespace seemed just a little crowded. Might try spacing the capships out a bit. Their beams have some surprising range.
Like I said: very minor gripes. Keep up that standard and you'll do fine!