I can't speak about the prologue as I joined just after it ended, but I'd like to emphasis something I think I already shared.
You seem to have built a pretty big setting, with history, backstory and all. Which is great, as it usually leads to a more consistent world. But it is overawing, and might be one reason why it was hard to recruit new players.
Try to summarize it in a short single paragraph, and clarify the approximate epoch so that the players can align their assumptions with it.
Overall, it was a promising game and I'm sorry that it ended so abruptly. Maybe we'll cross path in a future game :)