Even Candy Crush, a huge part of what made it successful, was the tiny details. The bright colors, the art, the subtle and not-so-subtle animations... An LLM can technically do all that, if you keep reminding it, and have strong rules, and constantly keep it in check, but there's no way it would do it on its own and keep it consistent and coherent.

Eg, if the tall green pill candy and the red round one both scale by exactly 3px when you drag them, it might still "look" wrong, and get into uncanney valley territory. And that's even assuming the LLM picked the same value to scale when you prompted it to "add a red candy", or it picked a different one arbitrarily.

I've tried making games a few times, or even CSS animations, and I can tell that they don't "feel" right, even if I have no idea why, or what to change. I have mad respect for artists and animators that can manage that, and I have no idea how you tell an LLM "It doesn't feel right when I drag the candies", and have it be able to figure out that a tall vertical candy needs to scale differently on the X and Y axis than a round one.