Hello lowwalleskey, thanks for the comment.
About the mouse, for security reason in web export you're not allowed to control the mouse. So I agree the controls doesn't fit well but that's not the purpose of this demo. Not sure to understand well what you mean in the remaining part of your sentence though. The source code is opened, fell free to copy and modify it if you wish to know how to setup Hathora system in a Godot 4 project.