Gamer ROB in a Multiverse? Maybe?

So, I am trying to do this out of boredom and to start writing in English again. I got this idea literally while showering a few days ago, so don't expect much because I have absolutely no idea where to take the plot and will also make a shit-ton of mistakes regarding characters and world-building. So, this guy finds himself in a room, with a ROB, and is thrown in an entire Multiverse made to be his playground. Oh, there's a system and he's not so sane, but those are details, right? I own jack shit, and you know that perfectly well. I mean, I guess that I got the idea for the MC? Maybe? Does that count?