Blast 'em. Use swords. Avoid fire. Power up. Those are the four bullet points made on the back of the Chaos Field package, and as a vertically scrolling shoot 'em up, that's all there is to playing the game.
Jam down the fire button, dodge a billion incoming missiles and hope your ability to mentally track all those projectiles is up to snuff. You've got about three seconds from the time you choose your ship to prepare for a screen completely filled with multicolored bullets, and it only gets ...