The latest update to the dark theme in Firefox is pretty nice. The cyan could stand to be a little bit darker, so it would be less jarring against the dark grey.
At about wave 80 all game balance goes completely out the window. Even maxed out grenades are all but useless, fully maxed damage does barely anything unless you also have a very high spread and manage to hit them with 3+ shots at once, and the amount of enemies that show up immediately tends to bring the game down to a crawl.
... wow. The chainsaw is extremely overpowered. My goal was reaching 5000ZP, so I went to the room with the car. One entrance for zombies in there. I taped down my mouse button and went off to watch a movie, and when I came back I had taken no damage. Otherwise it's a pretty nice game.
PROTIP: If you are going to submit a game as your own, edit the real author out of the credits first.
PROTIP #2: If you are going to submit a game as yours, do not use one that is rather well known, particularly for being part of the Shootorial challenge.
Umm... Think fast! Their eggs are too delicious to resist!