The same account works for the viviGo game and for the El Mono Inversor website. Deleting it removes it from both at once.
If you created your account with an email and password, open viviGo and go to Options → Delete account. You will need to confirm with your password. Deletion is immediate.
If you created your account with Continue with Google, or you cannot use the app, write to support@elmonoinversor.com from your account's email address, with the subject "Delete account". It is processed within 30 days at most (usually much sooner) and confirmed by email.
Games, leagues and invitations you shared with other people are kept as part of those other players' history, but with nothing that identifies you: no name, no profile, just an anonymous reference. They cannot be deleted without altering someone else's history.
The website's analytics events are anonymous from the start (they store no IP or personal identifier) and are deleted automatically after about 400 days.
More detail in the privacy policy.