Underwater Attack

Underwater Attack is a Horizontal-Scrolling Shoot em' up released on the Nintendo DS by UFO Interactive. The game takes place underwater, with all enemy ships shaped like a variety of undersea creatures. The big feature of the game is the ability to shoot 360-degrees. The gameplay is shown on the bottom screen, while all the data is shown on the top screen, gameplay is completely controlled by stylus. 
 

Story

It is the future and the Earth has been completely flooded. You are humanities last hope against the evil Chaos Empire, to defeat them you must pilot a top-secret ship and destroy the Empire's dread warmachine: The Crimson Star.