Never played the game before, so... Must be the newest version ?
First, I tried via the itch.io website ''in-browser'' version (Firefox's latest version). Didn't work.
Then, I downloaded the game via the Itch desktop program, to see if it did the same thing. I just clicked the 'Install' button and said 'yes' to it. Started the game and made a save and tried to load it. I tried having the save located on my desktop, in the Itch folder, and in the game folder(inside Itch's game folder). Same result each time.