Sorry, it should work and save automatically. You shouldn’t play the game in incognito mode/private browsing for the save to work.
I'm not, it's the standart Safari browser. But when the page refresh, save is gone. I need help about that :/
Is the safari problem?
Sorry, I can’t test on Safari, I don’t have it. I tried with firefox: new game->save->refresh->load and it worked fine.