This post is just to spread awareness. NintendoEverything (good friends who I have done work with in the past) posted a translated interview with the devs of Genei Ibun Roku #FE that covers what kind of game it might have been at first.
It is interesting for those who are fond of trivia, so I encourage you to head over there to read it when you can. : )
In order to respect their wishes, I will not provided the translation here. Please click here to read the full interview on their site!