Bonus mini-games - Successfully complete the game to unlock a new set of mini-games.

Concept art - Find collectibles during the game. Successfully complete the game to unlock the "Gallery" option to view the unlocked art.

Control credits - Highlight the flies and meteorite when they appear during the credits, and press A to shoot them.

Infinite ammunition - Collect all 81 meteorites to unlock unlimited radical-type weapon ammunition.

Music - Successfully complete the game to unlock the "Music" option, which allows you to listen to various tracks.