I like how powerful these mechs feel, but I feel like they need some balancing that doesn't directly affect their damage. One way would be to make their weapons drain your energy, so they can't be constantly spammed. It honestly doesn't take that long to recharge your energy anyways. To offset this a bit to not make it a straight up nerf, the mechs would add an amount of energy to your energy pool, with the larger mechs adding more energy.

Thoughts?