Canon Spike is probably the game I've played most on my DC. Great characters, great action, great gameplay, and a faithful arcade translation.
Zero Gunner(1/2) is pretty high up that list also - as is Ikaruga.
I would die and go to heaven if more smash-tv styled games came out.
As for Red Star.. there was a demo disc a while back that I tried, and it was borrrrring... maybe they have some improvements, but yeesh... no game there aside from the controls.