A shoot-em-up arcade game which brings a perfect blend of classic arcade shooting and original gameplay. The player's ship can switch between two different 'polarities' : White and Dark. The Dark polarity can absorb dark colored enemy bullets while the White polarity can absorb white-colored enemy bullets. If the player kills 3 enemies of the same color in a row, a combo is built up that adds to the score.
Ikaruga's prototype title was "Project RS-2", referring to Treasure's previous shooter, "Radiant Silvergun". This game is NOT a true sequel, but a spiritual sequel, to Radiant Silvergun.
Prototype version has :
No changes to the fighter's specifications concerning polarity.
Number of shots your fighter can fire is limited.
To replenish your supply of bullets have to absorb enemy bullets.
Can unleash successive Energy Releases.
When reserves run out, can only fire short-range blank shots, only effective at close quarter.