How about Pewdiepie plays on the Oculus one day for a video, but when he starts the game, he is transported inside of it. Pewdiepie realizes that Cutiepiemarzia is trapped inside. So Pewds has to go through different levels that look like different games he has played before (like an Amnesia level, minecraft, fnaf, etc). And at the end Pewds and Marzia take one last level to defeat the creators of the game so nobody else will be stuck inside it.