Unless things have changed in the last couple of years, HG authors don’t have to post the full game publicly, they just need to have a beta (of the full game, not a demo) that goes beyond e.g. a handful of the author’s best friends. That’s typically done by posting a public invite to take part in the beta-- not by posting the full game.
I’m personally in favor of getting as much feedback as I can on the whole game – but that’s a choice, not a rule.