Title basically. If one hasn't been made, would anyone want to work on one?
@ff03k64 Not that I'm aware of. I'm sure folks here would be willing to help you and answer questions if you post some of your ideas and progress making one.
@RogerCooper Have you seen any?
@redrum No one has done anything like that. Take a look at Steampunk 1915 for how to handle alien invaders.