This wipes your Bonkonauts account and everything hanging off it: username, password, session token, coin balance, unlocked skins and friendships. It cannot be undone and nothing is kept afterwards.
Still have the game? Open Settings and tap Delete account. It asks for your password and the account is gone on the spot, no waiting.
Anyone can fill in this form, so every request is checked by hand before anything is deleted, usually within a few days. Giving the recovery email that is on your account is how we know the request is yours. If your account has none, we may need to hear from you another way first. You can also write to privacy@werya.be.