Interesting, I didn't actually know that VB.NET ever got ported to Linux with the rest of .NET Core. Does it still have the drag-n-drop GUI feature to make graphical apps, or is that a strictly Windows thing?
And what makes this project significant is there's a lack of VB.NET tools on Linux. It has been challenging trying to get Gtk 3 widgets to play nice. Finally just rolled my own custom-drawn editor, treeview, and listbox. Going to release them later in a library.
You could also have used Mono.TextEditor btw. I personally find it better than GtkSourceView, and for having ported it to GTK# 3 myself, it was rather straightforward to port.