Unfortunately most people vibe coding games are programmers who don't know (nor do they care) about art and design, and so assume that everything but the code is trivial, just colors and patterns for the monkeys to look at as they press their buttons.
And then they wonder why the their ugly-ass game with no consistent art style and no coherent design doesn't take off since it was coded with a superior artificial intelligence, in less time, and must therefore be objectively better.
They don't understand that there's some knowledge that exists within the heads of human beings and their experience that you can't reverse engineer from the human-generated artifacts in the training data. You can't derive Leonardo Da Vinci from a PNG of the Mona Lisa. Am I claiming that all designers are Leonardo Da Vinci? No, so hands off the keyboard. I am saying there are aspects of art that are bound to the human experience in a way that are beyond current LLMs, that can't be replicated through the simulation of mechanics alone.
Say that and they'll just think you believe in ghosts, though.