We kind of invented it by accident in some ways.
If you won't tell us what it is yet, could you tell us what you were trying to do?
Well, it's side view 1v1 ship combat. We were trying to do that, and in particular model some things we liked from some other games. Some recent, some not. For a variety of reasons, the first models we tried really stunk. We then sat down and writing out potential models, and an offhand comment from Keith about a monster from a fantasy game suddenly sparked a whole new model we never would have considered. Completely unrelated to the earlier ones.
Vague enough? Sorry about that, but I'd rather not mention any of the games in question, because I'd really rather this be taken on its own without that context. The most core inspiration is not a connection I feel anyone is likely to make, and I don't want to encourage them to try. Now that I just did.