Extra levels
Each time you beat the game under one of the three difficulty settings, two additional levels become available, for a total of six new levels.
Alternate character color
At the character selection screen, hold Select on controller two and press X, Circle, Square, Triangle, L1, L2, R1, or R2.
View Neco's demo
Beat the game with any character, then hold Select + Start to restart.
Play as Neco and Modoki
Beat the game with Nox and Eve.