Despite hardware limitations, intrepid NES developers were able to make a massive variety of epic shoot-em-ups with gobs of enemies loosing salvoes of missiles and bullets at a hero and—magically—the system handled it all like a champ. Shmups on the NES rarely even experience any slowdown. Amazing!
tiger heli is still one of my favorites.
Memories of Life Force!
Gun.Smoke was what I always played. Became too much at times with all the enemies and things flying at you from every direction, fun game though.
Crisis force, Gradius 2, over horizon, the three best shooters on the NES for me personally.
Jackal and Guerilla War