At first look, Zombie Invasion isn't going to be the most impressive game you've ever seen. But in the end, it all comes down to gameplay and if you bear with it and give it a chance (reach at least 8 waves) its going to get crazy. The worst part of the game would be the absence of your character, in other words you only see the zombies, not yourself. It's not that big of a deal really but it does kind of suck. So zombies come in waves. slow moving weak (low HP) zombies, faster zombies, super fast zombies with high amount of HP etc. It gets real fun when you reach higher waves.
How to Play
Just point the mouse onto a zombie and click to shoot.
Good Luck / Have Fun