I feel super stupid but I can't find the option to save. I only see 'save and confirm' in the config but I don't think that's for game saves, only for saving settings.
What a great experience. I simply loved the atmosphere. I managed to find 5 different endings, but the fact that I had to find the fourth missing number by brute force makes me wonder if there is something more to be uncovered. Thank you for making this game :)