Any game worth playing will be so complicated that you would either have to spend more time and effort describing exactly how the game should work in English prose for the AI than if you had just written the code yourself OR you give a simpler description of the game and let the AI fill in crucial details you left out, which means it's not something entirely made by you and is part simulacrum. A computer screen is a large canvas you can repaint 60 times per second; there's a whole heck of a lot of tiny creative details in those 60 frames per second beyond the textures, models, sounds, and text. And in either case you have the additional problem that the AI will make mistakes (introduce software bugs) which you'll be unable to detect yourself.

One of the thoughts that's occurred to me in the current era is the importance of working with other people even on hobby projects. It's tough working with other people. We want to be the lone wolf and implement our own vision without interference from others. With AI, you can do that. You might want to do the programming but can't do the art, or you might be able to draw but can't do the programming. The problems are (1) fewer people want to play your partly AI-generated game over something 100% hand-crafted, and (2) there are loads of passionate people who really want to do the task you can't do yourself. We just need to find each other and make it happen. We weren't doing that before and are surely doing it less now, but it's more important now than ever lest we go down the path of replacing creative people with machines.