I personally consider SNK one of the most innovative companies of all time. Look at these examples:
Ozma Wars (1979): The prototypical overhead shooter IMO
Ikari Warriors/etc.: rotatable joystick
Victory Road (1986): Are there ANY games out besides Mars Matrix and Giga Wing that have as many things onscreen shooting attacking you at once?
Psycho Soldiers ('87?): First vidoegame witha fully vocalized song in it
P.O.W. (1988/89): Back attack
Various games: MAJOR voice and music accomplishments, even before the Neo came out
Street Smart (1989): First fighting game with two on two/two on one co-op
FF1 (1991): dodging, counters, the CPU could taunt, backdash
AoF1 (1992): Visible battle damage, super gauge, super moves, moves that weakn with abuse, taunting serves a purpose, unblockable super move
FFS (1993): Hidden character (Ryo Sakazaki), mid-air projectiles (Geese and Ryo)
AoF2 (1994): Throw escape
FF3 (1994/95): Too much stuff to even keep track of
The list goes on and on O_O