Hey! thanks for trying it :D
I'm sorry you didn't get very far. I know theres some game breaking bugs that I've fixed and I'm building it as we speak.
So far I'm really liking HDRP. The Unity team seem to have spent far more time developing that than the URP system. I kept running into issues with the URP system of having too many lights and baking not working. I know its meant to be for lower end devices but it seems too restrictive. For me HDRP has just worked perfectly but takes more tweaking :)
Its interesting that you thourght the URP version looked better. I might one day port it to HDRP and see if it still holds up but thank you!
I was almost going to move to unreal for the graphics, but I saw the Spaceship demo and it blew my mind. Unreal quality graphics in Unity. (but I think it takes more work)
https://github.com/Unity-Technologies/SpaceshipDemo