Complete stages in Arrange Mode to unlock art. View the art by selecting Special Option at the Option Menu.
Start with less life:
To start the game with less life, enter your name as NOMIS.
Hold L1 and R1 while selecting"Original Mode" or "Arrange Mode" and you'll be able to change the music.
Unlock Time Attack:
Complete Arrange Mode to unlock Time Attack.
To unlock "Extra Option" at the title screen, enter the Konami code: Up, Up, Down, Down, Left, Right, Left, Right, Circle, X, Start.