But it reminded one of the firsts prompts I tried with ChatGPT back in 2022. I asked him to simulate a text-based adventure (based on the discworld universe) and every command I gave it would behave as an open world text RPG. It was pretty mindblowing

(Ok, a bit unfair maybe as OP never demanded the LLM to be consistent)

Can you point to where the game is? Was there an interesting story crafted by a game designer for you to experience? Did you have to learn, through world-building and subtle cues developed over decades and your own experience with past games, what actions you can take with your character and how you can navigate the game world? Was there a skill gap that created a challenge and motivation for you to overcome and become good enough at the game to progress through the story and complete the quest? Finally, most important of all, did you have fun?

The answer to all of these questions is "no".

Is it impressive that Nano Banana can generate these images of a Legend of Zelda ripoff with just a few text prompts? Perhaps it is to some, but why not just play an actual Legend of Zelda game? They exist. They are good.

I'm not even saying that a game has to have all or even any of the qualities I mentioned above (they were just some examples off the top of my head). What I do think, however, is that whatever this is it's definitely not a game and you're definitely not playing it.