Hmm definitely lag issues in higher levels and a fully upgraded SMG becomes better than a gatling gun... the guns are so heavy that they considerably slow the player down allowing wolves and other faster enemies to deal more damage.
Kind of wish there was one really awesome upgrade that costed a lot of money so we had a reason to keep collecting money. I got all the upgrades by around the second boss. Good stuff though. 5/5
It would be a cool idea to put Raw Meat as a support item, when you put it in play the remaining Zombies will rush to it.
Would definitely help out to get rid of those pesky last survivors.
To those of you who cannot get the game to load I suggest first playing it on Armor Games I'm not sure why but when I played it for a bit there and then just tried loading it here it now works for me...