Hardest NES game?

[Brut]

Samurai Zombie Nation!
I suck at shooters tho.
Biggest issue I really had with this is that the projectiles you shoot (with all upgrades like 8 of em pop out every second) are the exact same color as the projectiles the enemies shoot. Also, when you shoot destructible stuff in the screen (which is everywhere and you WILL hit it since your shots are all over the screen) breaks into debris which is also the same color as your/enemy projectiles. It's ridiculous to try to see what'll hurt you in that mess.