@giacomoalbe I just wanna add one more success story of Vala and GTK on all platforms, it’s a FontBird
And by the way I recently tested (because also going to write something on Vala for Windows at work) HelloWorld app with all the GTK libraries, weighs 21 megabytes.
I also made this video This is a stupid illustrative example of the implementation of the guide, but youtube is a good platform for disseminating information, and everything posted there is remarkably indexed in Google.