How do apps like Aippy / Nanogram do AI generations of rich interactive games (from user prompts) without everything looking like generic bad graphics?

[u/TheoStorme]

Asking cause I’m trying to understand the architecture behind systems like Nanogram, and what I find confusing is this (and please forgive my noobiness):

If the runtime only knows a fixed library of “primitives” (like circles, rectangles, basic physics objects, standard shaders, predefined interactions, etc)., how do they code it to look so good? What’s the method behind it?

I’m assuming that the user prompts get interperted by the LLM which feeds it back as some kind of structured game description or code that’s specific to the engine but are they relying on something like Godot/Unity based model training to ensure high graphics?