Plot: Bangai-O is a multidirectional shooter developed by Treasure and released in 1999 on the Nintendo 64 in Japan. It was ported to the Dreamcast worldwide shortly after with some gameplay changes and updated graphics and audio. Wikipedia
Plot: Bangai-O Spirits is an action game for the Nintendo DS, and the sequel to Bangai-O which was released on the Nintendo 64 and Dreamcast. Bangai-O Spirits is a side-scrolling shooting game with free-scrolling levels that extend horizontally and vertically. Wikipedia
Plot: Assault Heroes 2 is the sequel to Assault Heroes, an arcade-style, top-down shooter video game developed by Chilean Wanako Games. The game was released on May 14, 2008. Wikipedia