Congrats on getting all endings! Apologies for the save file issue, I still have no idea what the root cause is :< (Only way I've been able to replicate it was to have 2 tabs opened when starting the game, and have the untouched game "overwrite" the existing game via autosave...) Great to hear that you managed to regain your progress with some save editing though!
I think you're one of the first people to mention favoriting the unicellular one haha, I really like that one too, considering I tend to picture NOVA as this lil blob most of the time, and now they're just BIG blob haha