Ikaruga is a vertical shoot-em-up game ported from the Naomi Arcade version, and it's often considered a sequel to Radiant Silvergun on the Sega Saturn. The gameplay revolves around switching between two colors - black and white - on your ship during playtime.
The twist lies in the fact that the black side of your ship is immune to black enemy bullets, which can be a bonus, while it dies instantly when hit by white enemy bullets. On the other hand, your own black bullets deal double damage to white enemies, and vice versa for the white side. This balance between protection and speed creates an engaging strategy.
Ikaruga also features unique enemy patterns and a combo system that adds depth to its original shoot-em-up gameplay. With these elements combined, the game offers a fresh take on the genre.
Ikaruga was released for the Gamecube on 2003-01-16, and it's available in the Shoot'em Up genre.