rez is (pardon my laungauge) THE BEST FUCKING GAME EVER! (except metroid and wipeout and a few others)
it's kinda like space harrier (or more apropriately panzer dragoon) on acid with decent (and on a few stages INCREDIBLE) electronic music. any description will fall short however, check some reviews or promos or something to see if you're interested in it first. personally i wasn't so throughly
enamored with a game in a long time before i first played rez. i think i logged something like 60+ hours playing it before i put it on the shelf (and this is a game that takes 2 hours to play all the way through)
zero gunner's a really neat schump , i haven't played ikagurga yet so for the time being i'll say it's the best on the d.c. 'cause the grafficks are nice and i like the controls. it's also not quite as screen filling as the capcom schumps and therefore more playable for old people with poor reflexes like myself. that having been said i wouldn't consider it worth buying, actually neither is cosmic smash or puyo puyo. just hook yourself up with rez