Akkanvader is an arcade shooter - a remake of the classic Space Invaders in 'manga' style.
The player controls one of the odd characters (dog in refuse bin, girl in giant robot. etc) at the bottom of the screen. The rows of aliens (pigs, chickens, and some strange creatures) begin usually at the top of the screen, and the player must destroy them all. Above the characters are three shields. Sometimes, player must kill a boss to advance.