Sounds really intriguing! I'm not even into the whole mech thing, but I kind of like this game. Two questions though:
1. It seems that revealing the secrets has to mechanical significance. Is it only for the narration? Is there any particular advantage or encouragement to eg. try to guess, or is it only the drama part?
2. It's not clear to me if, when the players choose to self-destruct, that automatically means that the UNKNOWN will be destroyed, or if they have to stay alive for four turns for the UNKNOWN to be destroyed.