Despite the random crashes in Slayer Pt.2 I reported, I finally managed to complete this campaign. I liked it very much, and after watching the final cut scene I hope there will be sequel.
I did however have some more problems with Slayer Pt.2.
I noticed that sometimes the Demon in that mission attacks Omega 2 and 3 with it's beams quite quickly, destroying both ships instantly. One time, I managed to only save Omega 1, which docked with my destroyer. However, the second salvo that the Lucifer class ship fires sometimes hits exactly the place where Omega 1 docks, destroying it as well. Because Omega 2 and 3 had already been lost, the mission failed in that moment. I don't know if this is intentional, if not you should maybe let the transport dock on the other side of the ship, where it can't be hit.