I'm pretty sure I once saw a scratch game in a game jam. Dunno what they did but yeah. Also, I really advise you to check out Unity, Unreal, or other game engines! They have a bit more power than scratch and aren't as hard as they look.
We'll see if I have time to put something together. Sometimes while I'm prototyping I just can't seem to find an idea that clicks and I don't end up submitting a game.