The Saikoro Game app collects your email address to create a user account and save your earned achievements, so you can recover them if you change devices.
Creating a user account is not mandatory, but earned achievements will only be saved locally on your device.
If you have created a user account and would like it and the associated data be deleted, please send an email to jm.tscn@yandex.com with the subject "Account Deletion Request" and include the email address associated to your account.