Early access is now available on Steam. I've been playing this for awhile in alpha and beta and it's quite fun. If you're interested, I'd definitely suggest the 4-pack since it's a great deal compared to the rest. http://store.steampowered.com/sub/43241/
It's WASD movement, mouse aiming almost like a dual stick shooter (sadly no controller support though). You level up and craft weapons, but you also level up during missions similar to ability progression in a MOBA. PvP and PvE are both very fun to me. I especially like how PvP is 3 teams of 4, keeps things from stalemating too badly and it's not just deathmatch either.