If you would really like to continue you can play the old 1.03 version and just remove rename your saved file to "Sans" again.
You can locate the saved file here:
C:\Users\"USERNAME"\AppData\LocalLow\Raft\Raft\SavedGames
Remove "Oldsave-" from you file and open it up in V1.03 and you can continue if you want to. Sorry about this but we are very early and most like future updates will remove old saves for now