Greatest run 'n guns of all time

[NOAH]

If this topic's already been thoroughly discussed, just post a link to it. Otherwise, I'm interested in knowing people's favorites. Feel free to include top-down single-screen titles like Smash TV, Robotron, and Total Carnage. I know the control scheme is entirely different from side scrollers like Gunstar Heroes, Metal Slug, or Contra, but I think you could still call 'em run 'n guns.

[BulletMagnet]

If this topic's already been thoroughly discussed, just post a link to it.

Will do.