CRAWL (Powerhoof)  

"Crawl is the local multiplayer dungeon crawler where your friends control the monsters! Battle through dungeons and power up your hero - if a friend kills you they take your place and it’s your turn to inhabit the monsters. It's a race to gain enough XP and loot to take on the hulking final boss!" - Author's description

Early access on Steam ($9.99) (Windows, Mac, Linux)

Early access on dev site ($9.99) (Windows, Mac, Linux)