Could you describe the issue a little more? What about the first dates is giving you trouble?
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The final game will be free since the original was free as well. The game will most likely stay on Itch since VanRipper has publicly stated that he wants fangames to avoid big platforms like Steam.
If you extract the game to a separate folder, the game should keep your saves just fine, no extra extracting required. Just make sure that all of the files are in that extracted folder and you should be good.