Make sure you're using the latest recent Google+ version after checking your Internet or Wi-Fi connection. When you initially arrive at the "Play / Evolution" section, click the gear icon in the lower-left corner of the screen to access the "Enable saving to the cloud" menu option. Select Enable Cloud Save to connect your Hungry Shark game data to your Google+ account. Data that has been successfully stored in the cloud has a green checkmark.
The first Google+ account that is signed in to the device will be utilized to save data. To transfer your game progress to your new device, sign in to your Google+ account. When you launch Hungry Shark for the first time, choose "Enable cloud storage" and "Data synchronization" from the options menu.