1. There don't seem to be any descriptions.
2. I tried to contact the author, but there was no response.
3. Regarding the author's poor design. First, there are hints, you just need to notice them. Second, the campaign walkthrough is not deterministic; there is almost always an alternative option. For example, iceTiTaN completed mission 3 without a Berserker. I couldn't do it, so I had to find a Berserker in the previous missions. Perhaps that's why I completed it a little faster, in exactly 2 months. Or take "Resurrected from the Abyss." I simply completed the entire game with a Harpy, while someone else did it with two generals.