It works, but it's a bit weird. I could not hit the enemy with pretty much anything aside from the minigun (cuz I think it's hitscan) - everything else either missed or did barely any damage. There's not much of hit feedback (neither for you nor for hitting the enemy). I managed to kill one mech before dying to the second one (I ran out of most of the ammo).
Dunno about the huge white plane right under the camera - at first when I spawned I was looking directly at it and thought that the game was bugged. I guess that's the main hull of the mech - but it feels a bit too big (unless you're trying to hide the legs for some reason).
Movement works fairly well though.