I’ve joined several jams but never published to a serious one(by “serious”, I mean a not-a-loosy-goosy jam).
Hopefully this would be an exception.
Anyway, good luck!
I actually went to many jams before the GMTK- (7 of them)
But did not submit even a single one
Then I guess I’m not the only one.
I submitted, like, one or two games in game jams.
And I've been in a few.