This is obviously not meant to be a real game engine. It shows that GANs can learn not only images but transitions between images given some action, which means

This is obviously not meant to be a real game engine. It shows that GANs can learn not only images but transitions between images given some action, which means they can be used as simulators. See world-models which used VAEs https://worldmodels.github.io/ https://worldmodels.github.io/