Zombie Warriors is a free strategy game by developer Genix Lab. It's a tactical lane defense featuring supernatural themes wherein players will command an army of zombies as they battle through various eras in history. It takes on a simpler approach to gameplay wherein they will only need to defend a single lane. 

Undead vs undead 

As its name suggests, Zombie Warriors will have you lead an army of zombies as you wage war across the ages. Starting from the Stone Age, face the opposing side in lane battles. As you progress, your weapons also advance, from primitive clubs to modern firearms and eventually to raygun-touting zombos donning futuristic spacesuits and riding UFOs. 

Build and manage your army from the Evolution tab wherein you can increase their base health, as well as increase "food" production to satiate their fleshy cravings to keep them under your control. As a side note, one thing that could be addressed in the future is the lack of multiplayer gameplay, which really makes sense for this type of game. 

Age of zombies 

If you played the classic Age of War flash game back in the day, think of Zombie Warriors as a spiritual successor of sorts, offering a very similar experience with a unique zombie twist. Adding multiplayer was a missed opportunity, but it doesn't detract from the fun time you'll have with it. It gets an easy recommendation and you should give it a try now.