The first KRetro Alpha Release is here! KRetro is a libretro frontend from KDE written in Qt with Kirigami! That means when given both a libretro core, and a game cartridge/disk ROM, it plays your favourite games. It is designed to be convergent, usable across all Plasma Platforms: Desktop, Mobile and Bigscreen.
I think anyone is allowed to develop a KDE app. You have to go through a process to get accepted for the branding I think. But it not like they spent paid employee time on this afaik.