If you're playing web version, might be an issue with cookies and stuff.
If it doesn't save on an executable, that's really weird
I installed it on my windows and have autosave on. But when i exit and go to load game it shows that i dont have a save.
Any message in the debug window (the black console window that also opens when launching the game)?
ERROR: Condition "len <4" is true. Returned: ERR_INVALID_DATA
ERROR: Error when trying to encode variant
SCRIPT ERROR: Trying to assign value of type 'NiL' to a variable of type 'Dictionary'
i got these errors when i pressed load game