SWOOOORDS! Colon Lords of the Sword is a 4-player cooperative dungeon crawling action game made in Unity 3D, inspired by Gauntlet, Golden Axe, Bastion, and Spiral Knights.
A very fun and addictive little "hack 'n' slash"; it may not be a RPG, but it is a satisfying singleplayer and multyplayer experience, especially having in mind the random nature of the levels.
Good music, fun multyplayer and a pretty difficult game.