Alternate ship color:
Press L1, L2, R1, or R2 at the ship selection screen to choose another color.

RayStorm ships:
Successfully complete the game in both arcade and original mode using the WR-01R, WR-02R, and WR-03 ships to unlock the R-Gray 01 and R-Gray 02.

Art gallery:
Successfully complete special mode with each ship to unlock three additional sets of displays in the art gallery each time.

Bonus Boss battle:
Finish the Dis-Human Boss battle with less than five continues used throughout the entire game to fight against the Infinity Boss.