Pretty cool TPS and i like the Alternative history setting you made, heavy 2legged war machines with brutal trench warfare, quite badass indeed :p
While i liked the aiming system, i feel it would be nice to not be "locked out" from firing weapons when not aiming, cause in some situations its a bit hard to properly aim at close enemies with the amount of zoom the aiming adds to the view, the other thing is more of a tiny nitpick but, i think one cool detail you could add if you keep adding to the game afterwards, would be to have some heavy footstep sounds to the walkcycle to really add to the imersion, cause the rest of the sound design already does quite a good job at that.
All and all i had a good time, even though i wasn't able to push all the way through the enemy lines,
good job :)