I found it So-so
Well, I found it so-so, because it is repetitive, there are just 3 types of zombies, you just stop playing of boredom because it is really easy, the music just sum it up ending in some bizarre elevator-dancing and there is no sound effect.
But, it is fun to play for a while! The zombies get weaker the more you whack'em up and it's good to see your weapon buffed up and just fountaining a lot of bullets, makes you want to level more up! Fix everything up, the gameplay is good.