Team Narwhal reporting for duty!
We based our game on the screenshot created by LegolaSS called "SeaKnightsGame" (Link: http://www.newgrounds.com /art/view/legolass/seakni ghtsgame)
The goal is to resist the invasion of the sea monsters as much as possible. For that, use the arrow keys to aim and press space to fire your basic attack. Also, you can use the POWER OF THE NARWHAL by pressing "X" but this will spent more energy than the basic attack.
Be careful, because without energy you won't be able to attack.
Hope you have as much fun as we had making it and good luck with the high scores!