It's a full engine not a library you invoke. It is not structured in a way to swap out pieces bit by bit. You can use GDNative to write your game logic in stuff

It's a full engine not a library you invoke. It is not structured in a way to swap out pieces bit by bit. You can use GDNative to write your game logic in stuff like C++ or Rust but it is tied to being invoked by specific parts of the godot engine same way the scripts are, so not really a good way to work towards swappable code.