Rocket Game 2000 formally needs access to your contacts. The app uses this permission only for accessing the user's Google ID. A player ID will be generated from the Google ID in order to identify the player when he/she plays Rocket Game 2000 on another device (that is also linked to the same Google ID). The Google ID won't be stored or given to others.
Rocket Game 2000 is an app by Maximilian Schillinger. You can find contact details in the imprint.