A
That’s because it is!
It’s the ATLAS, a giant robot boss from Hard Reset. Hard Reset is best single-player shooter I’ve played in a long time and I play all the shooters. In fact it’s probably the only true single-player shooter since multiplayer turned campaign modes into extended tutorials mixed with cut-scenes.
(Possibly relevant fact: Steam have a free demo of Hard Reset you can play right now. But I should warn you that ATLAS is only in the full game.)