Yeah as nice as this is, the overlap of console editor enthusiasts and those willing to hand yet more data to Google is going to be narrow.
You can sign in but you can't sign out.
What if it was email password? Would you prefer that?
Speaking personally, absolutely yes.
Your target audience is anti-Google login lol, listen to the feedback! Great work
Lol I'm not the one who made this, I am just curious.
Yes! Also consider letting people learn without authenticating at all. Those who care to save state/progress can log in. If you had an opportunistic "great job on completing level 10! if you want to save your progress, register here" message, I bet more people would register as well!