the game isn't updating my saves anymore for some reason, just remains the same save file every time i try to update my progress and doesn't let me make new save file either
That's something I haven't encountered before, so I don't have a solution for this.
The only thing I can suggest is, to copy your save folder somewhere and re-download the game again.
Once you have the new download, unzip the game, and move your save file into that, and see if that resolves anything.