Is Zombicide fully co-op as well ?
yes. Effectively the zombies will react to noise generated by the players, moving and attacking. Its also worth noting that the zombies auto hit players - effectively taking 1 item (at random) and delivering 1 wound. Two wounds and a player is dead with no respawn option in the game.
Also when you shoot weapons you have a predetermined hit order: the first thing you hit is another player
with the harder / faster zombies being last in line to take damage.
Also, you need to have a weapon that deals specific amounts of damage to kill the bigger fatties and abomination. Without it you dont do 1 wound leaving 2 wounds etc, it simply has no effect.
Overall its a great coop zombie game, with the definitice vs zombie game being last night on earth (also have this + 1 expansion and both play different enough to be good games on their own)