Ikaruga
About this game
Ikaruga is a bullet hell game developed by Treasure. It is the spiritual sequel to Radiant Silvergun (1998) and was originally released in Japanese arcades in December 2001. The story follows a rebel pilot named Shinra as he battles an enemy nation using a specially designed fighter called the Ikaruga which can flip between two polarities, black and white. This polarity mechanism is the game's key feature and the foundation for its stage and enemy design. All enemies and bullets in the game are either black or white. Bullets which are the same color as the player are absorbed while the others will kill the player. The game features both single-player and cooperative modes.
In this vertical scrolling spaceship shooter, you control a ship that can change its polarity at will. As blue/white, the ship can easily destroy red/black enemies, and visa versa. Bullets of your polarity can be collected to fuel your missile gauge, but those opposite will kill you. Destroying an enemy ship will make them drop points for you to pick up, but they are polarized, too. Different difficulties exist to change exactly how you interact with polarized points, or how they appear. Ikaruga is a balls-hard shmup with lots of difficulty even at the easiest level, and lots of replay value for those willing to face the challenge.