I'd rather see AI being used to generate new games for old platforms (console emulators) than these faux-retro things with mixels, inconsistent graphics styles (some blocky bits, some curves), and rotation of squares.

Constraining the canvas to a low-res pixel grid would be an instant improvement. The recent post https://airport.apunen.com/ does a decent job of this but it, too, has an odd mix of modern aircraft sound fx and vintage biplane graphics. It doesn't feel very retro because it's full 3D rather than limited 2D sprites of a 3D scene.