If you want to start from scratch, simply reinstall the game. You will see the popup offering the old account ― just choose 'No' and the old progress will be deleted.
If you want to completely delete your account from the game database without the possibility of further data recovery, contact us at support@zeptolab.com, mentioning your game nickname and ID (it can be found in the "Friends" tab).
If you want to completely delete your account from the game database without the possibility of further data recovery, contact us at support@zeptolab.com, mentioning your game nickname and ID (it can be found in the "Friends" tab).