In order to save and restore your game progress, we recommend that you link the game to your Facebook account (we promise we won't post anything on your wall).
Do so by clicking on the next level, and then "Connect."
It will ensure that your level, coins, boosters, and your team's information (whether you are an admin or just a member) will be saved and restored as well.
If you encounter any issue while performing the above, please let us know by tapping the "Submit a request" button in the upper right corner.