KyoZz
Tag, you're it.
The classes:
A siren (specialized in melee)
Moze, The Bot Jock (a soldier who can summon a mecha)
Zane, The Operative (an assassin with many gadgets)
Flak, The Beastmaster (a robot able to appeal to various critters)
The Children of the Vault seems to be the baddies and the game take place (at least in part) on Planet Promethea (where the Atlas Corporation manufactured weapons from alien technology).
From the trailer on Youtube:
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