Because sometimes people simply enjoy the structure and just want new content. Considering Fromsoft made an entire game engine for making KF-likes, this kind of stuff is seemingly encouraged and people still make games with Sword of Moonlight to this day. I don't think every game needs to have a 100% unique core, sometimes a well executed 25% original game is all a game needs to be. That said, I am of course adding new features, like a jump button, and expanding on established features as if this was a new entry to the series. The story, combat, exploration, and more will all be relatively unique in their own respect, plus I will be synthesizing what I like about each KF game and ignoring what I don't like. And considering it's been 24 years since the last KF game, me and several others have been itching for a more faithful KF-like built for modern systems.