Overkill & Lunar-C
The game is a horizontal scrolling shooter. After a wave of enemies is destroyed, they release a power-up token. Collecting it will advance the weapon select gauge by one step, similar to Gradius. In this way, the weapon systems of the player's ship can be upgraded. If the player hits an enemy or a bullet, their energy bar is reduced. At the end of each level, a guardian awaits that needs to be destroyed in order to advance further in the game.