That’s odd, I’ve never seen that before. From some googling it seems most browsers have a localStorage quota of ~5MB, which should be plenty (My endgame saves seem to be around 100KB). Maybe try deleting some old saves or try a different browser?
You’re right, thanks for reporting! I don’t think this changed in the new update, so I reckon this has been broken for a long time. Whoops!
Fun fact about AI chat-bot style games like this one. You can literally tell it to do anything. You don’t have to click the buttons it displays. If you type in the message area that you discover you’re a god, the game makes you into a god. Go hog wild with it.