this is what I do.
I make a Google folder on Drive for each student. I share each individual folder with each student. I name the folder something like: TheirName_GameDrop
When I start my lesson, they are modifying a c3p file and I have them save it to their respective GameDrop folders as they work on it.
If they have a question or I want to see their work. I make sure they save, then I open their project, from that folder, on the Stream and everyone can see it.
I also have a GameShare folder that a share with the entire class if I have small examples for them. Or they want to share their games.