Decent experience, lack of audio kinda sucks though :P
Could've definitely changed a few things, like egg pickups. The leftmost chicken just never seemed to run out of eggs, no matter how many times I ran over it. A visual indicator of if a zombie is near would have also been nice, as typically, unless I got damaged, I could never tell.
Graphics are cool, definitely the game's strong point.
More farm upgrades could've been cool too, though the defense upgrades are fun.
Good job overall.