Dungeons & Robots [Steam, Official Site] is currently in Early Access and it looks like a lot of fun, the developers have recently given the game an official Linux build.
It has generally good reviews, with only a few complaints, so it seems like it may be worth a look!
About the game
Dungeons & Robots is an Online Action Shooter RPG, where players team up to battle various enemies, collect resources and dominate territories. Features include, fast-paced combat; elaborate crafting and inventory system; customizable characters, weapons, armour, powers and skills; procedurally generated environments and items; solo missions, 1-4 player co-op, and guilds. Explore these futuristic dungeons to fight, conquer and dominate.
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