Fixed Save on Game Upgrades

Fixed the save problem. 

Save/Load now works after uploading new versions of the game.

The problem occured because game updates on Itch.IO are stored in a new subfolder and a new save is created in the IndexedDB of the browsers.

As workaround I now save the userdata in the local Storage of the browser. The key there is persistant on upgrades.

I'm sorry if your save file was deleted. This should not happen again on updates. 
But of course it will happen when the browser cache is cleared.
So please export the game data from time to time.