This erases your account and the personal information attached to it. Your character, what you built and where you built it are released. It cannot be undone, and it does not refund anything you have bought.
Type it below and we will send you a link. Opening the link shows you one more button; nothing is deleted until you press it.
We have no way to tell from a browser that the account is yours, and we will not delete an account on an unproven request. Open the game, go to TERMS → DELETE ACCOUNT, and delete it there — the app proves it is you with the key your phone holds.