While player 1 still plays the game with a regular controller and plays it as a traditional shmup, the 2nd player has the option to play with a GunCon controller and blast everything on the screen while player 1 dodges bullets and shoots. There’s a 1-player light gun mode as well

This is another weird instance of Namco licensing out GunCon technology to just about anyone who would have it back in these days, but this is a pretty fun and unique way to implement the functionality into a totally different genre, albeit it being an odd genre to combine it with

Where the first game in the series was 2D, this one brought 3D visuals but still kept the fun parody/meta shmup elements and also had lots of great music including character image songs, and a full anime OVA episode that’s unlockable after playing well enough