Helicopters couldn't kill me. Bikers with shotguns couldn't kill me. You throw enough punks with green hair in my way? That'll kill me.
I love how adorable the mech looks, and how satisfying it is to kill the little grunt guys. My only minor suggestion is to just reset the heat every wave. I found myself standing still between waves, and with no timer, there's no downside to resetting it.
I like the shoutout to pixel eyes too :P