Account deletion means that your account and everything associated with it, will completely get deleted from QS Games base. This means that your personal data, friends, resourses, progress, including all purchased items, ID and rankings will be gone permanently and irretrievably.
 
Your account will get deleted during 25 days from the moment you confirm the deletion. Once you start the deletion process, you will be able to access your account without canceling the deletion. If you wish to cancel the deletion, please contact our support team.

If you want to save your data and other games - you can reset your progress. Details in the article 

With love,
Your Farland Team