The same thing happened to me. Lost many levels of progress and many days of gameplay. I enjoy the game, but not enough to rebuild (or re-purchase) everything I've just lost. I truly hope an admin will address this issue soon, explain why it happened, and give us a way to restore the game from our local save files.
Tonight when prompted by the game, I chose Cloud storage. Big mistake! I lost most of my progress in the game, including Region 5&6 weapons. How do I switch back to local storage?
This also happened to me tonight. When prompted, I chose Cloud storage and as a result lost several days' worth of progress, multiple levels, and two high-end weapons. I want to switch back to Local storage, as this may help me reclaim my progress.