Kids nowadays call anything 8bits...
8-bit color
I'm being particularly nitpicky about this only because I love 8bit style graphics. Just check the game on my signature and you'll see ^^
And yeah, by "sounds" I meant the zombies, they sound like they don't belong in this game.
One other thing, the collisions could be simplified at some points, like on vertical walls. If you are too close to them, sometimes, you can't jump.