well if u having the save problem i think its to do with the launcher i manged to play a littlebit into the game and save using the .EXE 64bit version of the game that i downloaded from Itch just grab the 3.14.1 version and place it into the .exe and fingers crossed u can save i didnt have problems saving today since i did that also for good messures download the latest java packages thats what i did might helpFrom that link
So they know about it and it's some kind of Java error.
No mention on what to do to fix it though.
My Java is updated and i think i'm using a default install.