Some players reported that their progress looks lost when switching between the ZIP version and the itch.io app.

This is caused by the itch app sometimes running games in a sandbox mode under a special Windows user account called itch-player. When that happens, Unity saves your progress here:
C:\Users\itch-player\AppData\LocalLow\Tiny Secret Games\Snapshot!

Instead of your normal Windows profile path:
C:\Users<USERNAME>\AppData\LocalLow\Tiny Secret Games\Snapshot!

So if you:

• play from the ZIP build directly, your save is under <USERNAME>.
• play from the itch app (sandbox on), your save is under itch-player.

Fix:
If it looks like you lost your progress, check for your savegame in the other folder and just copy it over. That way your progress stays consistent no matter how you launch the game.

If you want to avoid this issue completely, just always download and run the ZIP build directly instead of using the itch app.