Good game, BIG flaws!
This game is fun as hell, but it has ONE FATAL FLAW THAT YOU NEED TO FIX! It's the pause button. Some one calls you when you are at wave 8, and you can't answer because there's no pause button. The menu button just takes you to the MAIN menu?! In other words, there's no pause button. Even if the game is short, there is no excuse for that.
OK... Whats good about this game? Well, for a pixel game, the graphics are good. The music, and sounds are good, but the music just doesn't fit.
The game play is good, but the level is a bit crowded, giving you little space to escape when there's a hoard of "little zombies". Add to that the incredibly short amount of ammo and your screwed. Overall its a fun, and addicting game, with a good challenge. You can't really bash the game for lack of variety in zombies, or repetitiveness, because it's too short. 8/10 4/5