I can give you a critique
At first: The Mech isn't bad. It has a modern style, a little bit like these Metal Gear stuff and the overall shape is good.
There's a lot of comments here, so I don't want to write a novel.
If you look at the details, there's a few disadvantages, that I don't like. The Style is important for designs like this, but functionality also. What would I do?
Torso: The backbone looks too small for my taste, because you have to build in wires, connections, servos ect... + it would be good for a machine like that, to have the ability to rotate the torso.
Weapons: The shape is cool, but they don't work. It looks like rotary style cannon's, but with the angled shape, they can't rotate. The shell ejector is missing, there is no gear for horizontal aiming/moving and no logical ammunition feeding.
Omnisensor: The gear for horizontal moving is missing. Otherwise, there is not enough space to rotate the sensor on this axis.
Myomer Muscles: I don't know why there's a description for this, on especially that place. I can't see a logical connection for myomer muscles from this place, to the rest of the leg or hip.
Legs: The shape is cool, but you have no shock absorbing qualities, because the mech is already in the squat.
Feet: It works with the design, but it is a disadvantage in the reality. The mech could walk with feets like that, but the stability and balance is much wors in comparison to bigger ones.
Back up Weapon: Take a bigger one with 7,62mm caliber. That's a machine. They have no problem with higher recoil and ammunition weight. The 7,62 mm caliber have a higher accuracy, range and stopping power. If you like to use proved and tested german weapons, take the MG3.