The only personal data Scooter Boy stores on its servers is what you submit to the leaderboard: the nickname you typed, your score, and the date. There are no accounts, emails, or device identifiers.
Because nicknames are visible to everyone on the leaderboard, deletion is protected by a deletion code — a private code the game showed you the first time you submitted a score with the current version, and saved on your device. Enter it below to remove all of your leaderboard entries — from the all-time board and every daily board — immediately. This cannot be undone; you'd have to earn those scores again.
See also the privacy policy and the game.