I did something similar, but instead of having the LLM play the game I had it build an entire bot system to play the game. Bots require much more determinism, but I'd rather burn tokens encoding problem solving approaches and bot decision profiles than using LLMs for every turn of the game. This can be developed rapidly if you create an agent in a loop and say "figure out how to have the bot reach room 3 in under 10 actions" or something like that. It is easy for this to get bloated, but I found it makes a nice feedback loop that allows me to quickly test things like pacing changes and think of the game as a series of user actions that can be sculpted purposefully.

Thanks, this is another great idea and I'll consider it as an addition or alternative. Do you think this works in an open-world, non-linear type game?