Jack The Fugitive is a side-scrolling shooter set in a futuristic dystopian post-apocalyptic world, where everything is dying but Corper cities, basically fortresses where one is forced to conformity.
All in all, the graphics and music are of good quality, the gameplay is engaging, but, the best part of the entire game is the storyline. It's not the most unique, but it's well written, features a romance (within marriage), comedy, and all-around action. It's not the greatest, but it's the best you'll find free in your web-browser of choice.
The Article Link leads to the main place to play the game.