If you have it on the itch.io app then all you need to do is just have it in downloads, right click the game and press "check for updates" it should automatically update while keeping whatever save files that are saved on the pc without making any new ones
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Just download the update and play :)
If you're on PC, Mac or Linux: download the update file, extract to a fresh folder and play!
If you're on Android: download the update file and install it over the old version (DO NOT UNINSTALL THE GAME!)
In both cases your saves will be automatically transferred to the new version.