itch.io

Damn, I can't find anything.. I'm very sorry, the problem must be in the "engine". I will try to use previous versions of it. Hopefully, this will help and nothing will break in the process. 

Phew, I finally realized that the true version of the game is always the latest one. Sadly, it "shows" the version of the savefile. 
If you saved in v0.9.0 and loaded it to v1.0.0, the game will still be v1.0.0, no matter what it tells you. 
So, false alarm. Thank you for your feedback, I'm working on the solution!