I like the idea and the customisation options of the mech with the different classes and all and for a first game, it's quite impressive that you packed so much features and went 3D.
Sadly i found the game still has some issues :(
Mainly the difficulty in 2 ways, first the camera that's zoomed in a bit close and doesn't really help anticipating enemies and their attacks, and then the enemies fire rate wich is absolutely insane O_o
Regardless, i think if you re balance things a bit you've got a solid base there, plus i like that you still managed to make multiple levels even though it's a jam game :)