I think if the mysterious person had less of a role, it'd feel more like an easter egg. Rather, I'd say they were a somewhat large part of the story, as one of the games was cut short due to them. and hearing nothing more about them felt like I was missing out on somewhat important information. Also, I wouldn't mind proofreading the game's text sometime next week when I get some free time ^^ I'm one of those weird people that enjoys that kinda stuff lol