What I mean is it doesn't matter how careful you prompt, without a good understanding of coding and game design AI will always create a buggy mess, even when building within a solid foundation like unity or godot. It doesn't understand context, it loses its train of thought, it goes down rabbit holes to fix bugs and makes things worse.
Building a game engine is hard work, even for the most experienced game developers. If you let AI build all the back-end you're building on quicksand.
If you decide to go down the AI coded route (I still wouldn't recommend unless you're going to use AI as a learning tool and actually take interest in what it's producing), I would recommend you build some prototypes in unity. From what you've alluded to so far I can't see any reason why you can't build it in unity.
We're just trying to help, save you some time and money. Tokens are expensive, and what you're describing is going to waste a load of them for what will probably be a buggy mess.