It was pretty fun, actually, if a bit short. Why not include an enemy warship? One strange thing I noticed was that you could fly the GTF Pegasus, the GVF Ptah, and the SF Mara(terrans). In general, unless there is a good reason that is explained in the briefing why you should be given these ships, they shouldn't be allowed. Also, the briefing exists for a reason. You can use that to explain the specifics of the mission, instead of explaining it after the mission started. There were a few grammatical errors, but they were small and didn't detract from the gameplay.
One more thing. At the end, the Abbadia jumped out but I didn't get a directive to return to base. I tried jumping out, and there was no debriefing. When I tried jumping out at the beginning or after the Abbadia was destroyed, I still got no debriefing.
The background looks incredible though, great job with that

And I like how you commented on how it was unlikely for pirates to have Ursas with Helioses(I once played a mission with "Shivan Pirates")