This game saves your game data to a server once every 15 minutes to back up your data. This contains your game progress and also an unique id depending on the platform where you play it. No personal data is taken. For Android the id from Google Play Games is used. If you didn't install Google Play Games, no backup will be made and no data taken. In Steam and Kongregate, the id from your login-name is used. This game recognizes your unique id and you may get your game save back if you lose it, or change your device as long as you log in with the same account and click 'Load Online' before the autosave takes place.
This game has been built with Unity.
For the android version Unity collects error reports and also some data like your IP address, country and device model. Unity Ads may collect device information, such as IP address, device identifiers, and information regarding the delivery of ads and your interaction with them, all of which may be shared with ad publishers and attribution companies. Unity Ads may also incorporate data derived from the Unity Analytics service in user profiles and use that profile data in order to provide personalized advertising. You can see exactly what data Unity takes and have the option to delete it if you click the opt out button on the info page.