Games Like Endless Onslaught

The world has been corrupted by an evil race of zombies, and you must defeat them! You find yourself in a camp, the stronghold for the very last humans, where you can train, upgrade and discover new weapons.
You must take to the battleground, exploring flaming volcanoes, desert islands, expansive plains and more. You must fight unique zombie types, with different powers and abilities to gain new, exciting weapons!
Once you have enough gear, you must choose your favourite weapons and upgrades to go and fight the King of All Zombies!