Part 1: [link]
Part 2: [link]
It may look impressive, but you'll crap yourself once you realize the game only gives you ONE LIFE to do that entire boss rush run during loop 2 of it (Second Video). One bullet touches you, you start over.
I got some practicing to do...
EDIT: Oh yea, for the people who can't read Japanese, the game is called DoDonPachi Dai-ou-jou.