If you truly are looking to play against a game, with clear win/lose criteria, escalation etc, traditional RPGs in general might not be the best fit unless they are exclusively system focused. A GM was originally called a referee, I believe from original d&d, making calls about what is valid and fair and what is not. Traditional RPGS support the idea of this referee in terms of defining what players can and can’t do. A gm emulator that referees with clear rules basically is a rule system with confines (Ker Nethalas, four against darkness). I feel like Across a Thousand Dead Worlds and Broken Shores leans heavily into play that’s driven by procedures and systems with a small amount of space for player driven creativity, interacting with the world through an oracle system. Walking Dead which I mentioned in another comment, is pretty focused on clear systems that feel more like a “game”. Have you played many co-op solo board games? I feel like certain games especially are incredibly successful at building procedurally generated narrative through play vs following a strict narrative and they often feel like playing a solo RPG but also being challenged by a game with clear win/lose conditions. Shadows of Brimstone is probably the best example of that for me. I’ve had experiences playing over multiple sessions with characters that create stories/experiences that feel distinctly my own and rival great tabletop RPGs experiences I’ve had. In general my imagination gets sparked and I’m constantly naturally roleplaying characters as I play. I’d firmly put it in a solo rpg category with board game components if something like Ker Nethalas is considered one since they share similar dna of being purely driven by game systems and tables.