Hm, maybe it’s because you’re playing the game through an archive program? The program might just not be updating the save file. Like, make a save in a new slot and see if it keeps the new save.
Maybe try to see if you can extract the folder normally and play it straight in there.
Okay, since you can’t seem to get the game working through a zipped folder, I’m going to put up the installer exe as an alternate download when I’m able to so that you can play it directly. I think it will work if I do it that way.