If you were playing the online version then yeah, sorry.
Not really. I can make the old version available to download for a bit. If you download that and it doesn't let you load your save then you'll have to restart. If it does work you can load the save, make a time machine save and then try loading that in the new version.
I'm thinking of adding a timer to the game that will count down to the next save so that people have a warning to make a time machine save. Or if you're in the discord I announce when the next update comes out ahead of time