I'd already lost part of my progression a few days ago, due to the facts that the game can only save your progress when you're online and that if you pause the app for a while and come back it's likely that it will restart instead of taking you where you were. The result is that any progress you make offline is likely to be lost and if you don't keep the app open until you get online again.
But now, it's everything that's been lost. I'll file a support ticket, but I'm very disappointed to see such bugs in a supposedly finished product.