I have a simple script system in my editor that is designed to let the chatbot (Claude) to work on the content. The script interface lets it to import assets into the project, open them for editing, take a screenshot, export content (and few other things). All data is in JSON so it typically figures out the data format quite fast and easily.

Here screenshots of some UI styles that it generated.

https://github.com/ensisoft/detonator/tree/master/uikit

Bevy is a great engine for LLM-based games because it's 100% code. I'm toying with a few things in it, one of them is an entire-planet economic simulation, and it scales well up to a million dead tiles and 10k-50k live tiles on Apple Silicon, pretty impressive.