I did finish the campaign shorty after my last post here, so sorry about the long time it took for me to reply
Mission 11: It's kind of scary how easily all of the Terran ships went down here; the mission is very short for that but I think that works well in context.
Mission 12: I got the same Red Alert problem as CKid, with the Hurricane not appearing at the end. Not having read his spoilered post, I kinda wondered whether the resulting impossible fight was intentional to punish the player for dooming humanity
and so I ended up using cheats to make myself invulnerable. Nevertheless, the effect of the sounds gradually going quiet along with the foreboding music worked quite well.
Good job with this campaign
I felt the difficulty might fluctuate around a bit, but atmosphere-wise I really like the presentation, and as I said previously, an interesting way of presenting things from a Shivan point of view that still allows them to seem alien