There isnt much you can do with the shoot-em-up genre these days that hasnt already been done. You usually have a character, sometimes someone in a spaceship, and other times a person who is magically able to fly and shoot projectiles. You often find yourself moving from one end of the screen to the other, shooting down enemies as they show up and doing your best to survive. Now imagine this classic concept in reverse, with you flying backwards in time instead of moving forwards. Add a musical spin on it and you have Retro/Grade, a game that is actually less of a side-scrolling shooter and more of a rhythm game.

[Source: N4G: news feed ]