Well, I have released a new game on Steam called Corridor Sigma. It's not strictly a GameStudio project as the actual game is running in Unity...however I used GameStudio extensively in the development, for prototyping and level editing. I think this kind of thing is where GS is still most useful. For instance, i was able to write a level editor very easily and just output text files that could be read in Unity.
here's a video: [video:youtube]https://youtu.be/KenH0q8Zkzg