The game has two different main gameplay modes. In "extermination mode", the game plays much like a 3Dthird-person shooter, while in "defense mode", the game plays like a 2Dsidescroller.[3][2]
On October 20, 2011, a demo of the game was released on the Japanese PlayStation Network, allowing the first chapter of the game to be played.[6]
The game was released digitally on the PlayStation Network, and physically at retail. The retail version exclusively came with a sixteen-page artbook by character designer Katsumi Enami.[5]
Reception and sales
The game charted as the ninth best-selling game during it first week of release, selling 15,623 copies.[7]