This is cool, it's kind of like Blazor [0] in the .Net world although I bet the resulting code is a lot smaller.
If I can make a suggestion, though, the "root.vugu" code snippet from step 3 on the Getting Started page should be one of the first things in README.md and on the vugu.org page. It gets the core idea across right away, just like the code editor at the top of golang.org quickly shows what the language is like.