Still planning on working on one engine, but I mainly brought this up as I never saw anything quite like the dynamic sky or the low poly water in Godot before. Vertex displacement shader... I'll have to check that out.
The dynamic sky might be easier to imitate with Godot 4, as we now have a sun, I'm just not ready to dig into it just yet, and hopefully, by the time I am, it will be officially released.