I'm not a fan of zombies, but this I like. The dice pool system is constrained, but a nice way of working with the limited probability space of a d6. The target number being dependent on the character and their damage is an interesting notion, but I'm not sure that ranged should map so closely to melee here. The ever escalating zombie threat fits the theme of the game as well, with noise always going up.
The zombie survivor thing touches on the Jam theme of redefining failure, but it's not a close match. The Zombie survivor can't contribute to a victory, though they can help prevent other players from winning, so having your survivors die is still less than ideal, for all that they gain their stats back. These rules also aren't doing anything particularly original, but are otherwise a fairly strong bit of small design.
-Actually Ayleczander this time.