Spiral Knights, Unite!

You crashed on the planet Cradle. You were stranded. You fought. You weren't alone. You made some friends. Now we trade, explore, and fight together as one!

Brief Description of Game from Steam Store Page:
Band together and fight to the Core! Spiral Knights is a cooperative adventure in a persistent world with a focus on instant, fast-paced action. Arm yourself and join the ranks of the Spiral Knights; stranded on an alien world, they must explore the ever-changing Clockworks beneath its surface in hopes of reaching its mysterious Core.

Spiral Knights Website[www.spiralknights.com]
Spiral Knights on Steam
Spiral Knights Wiki[wiki.spiralknights.com]