The thing is; a top down shooter can work on the NES. There's Super C that has 2 levels exactly like that and it plays fine. Then there's another game called Heavy Barrel (also an arcade port) and it plays absolutely fine. In fact, I'd say Heavy Barrel is very underrated and a must play if you like top down shooters. Then there's Gun Smoke which is along the same lines.
But Ikari Warriors, all three games on the NES are terrible.
agree with you 100% w/ gun smoke. it had the perfect scheme with B, A firing one direction respectively ala side arms/section Z
and simultaneously pressed, fired vertical.
i played ikari 1+2 on nes and felt 2 victory road was a bit reasonable to control as they adapted the sword so you don't have to manually swing it via rotation to deflect bullets.
IIRC the game allowed static angles (very foggy but i believe i was able to strafe staying vertical. but i can't be for sure)
Ikari 1 was very strategic. that needed diagonal strafing. or it was impossible to proceed without dying. (no ABBA bull-rush)
.
the area with:
-the stone heads that fire arrows horizontally,
-while enemies on the roof tops drop red grenades:
-assumed you're equipped with
F, L, bullets (B wasn't necessary)
the game in that area forced players out of a tank and go on foot using strafe angles w/ F,L as the enemies were nested @ top far corners as you advance in an S pattern counter clockwise.
layout of the stoneheads and enemies didn't allow players to shoot straight.
i tried to do this on nes and agree it wasn't a great port. got so mad i just said F' it, just plow through it mindlessly.
Heavy Barrel (data east coin-op) level design was a bit more forgiving than ikari. I
i never played the nes version but i believe you it's probably good enough to play
super C was great, still holds up today..
those top boards felt fast paced more like Mercs or Commando and agree no need for a 360 rotational stick =)