It's really buggy. Menu on game over and level end doesn't work. Bullet time doesn't end. I have no idea how to get out of the mech in the second level. Chainsaw doesn't do anything.
Mouse sensitivty is really weird. If it's supposed to be a limited turn speed thing, I think there should be two "crosshairs", one for actual mouse position (and it should be visible to communicate that it's actually responsive to the input and where player will end up aiming) and the other for actual mech orientation getting interpolated to the mouse position.