Wild Sky TD:Tower Defense Coop

"Wild Sky TD is a 3D tower defense game with a fantasy world setting, where players must defend their kingdom from various enemies in over 100 story-based levels. With 10 unique towers, 6 heroes, 12 spells and different affinities, players can employ strategic depth to stop Orcs, Zombies and Dark Elven lords. The game also features an in-game progression system with reward mechanics."