Cheat mode:
Press C, A, Right, Left, C, A, Right, Left at the main menu. Begin game play and pause when Aero appears on screen. Press Up, C, Down, B, Left, A, Right, B, then hold A + C to display the cheat menu. Options such as unlimited lives and level select may be enabled.

Unlimited stars:
Enable cheat mode and enter the level selection screen. Press Left, Right, A, B, C, Left, Right, Up, Down, Left, Right. Press Up and throw a star simultaneously to fly.