I agree the blood look totally out of place in the concept art screenshot as it feels "arcadish" and so is totally silly.
But the corpses, at least as portrayed in the concept art there :
does not look as silly and out of place at all, does not look like a gore fest either and those pixels do not look more violent that the bunch of pixels defining burning vehicles.
I can live easily without it as it has been years i played and never seen a single corpse in a Steel Panther game, but i don't really understand some of the reactions here defining this as silly/kiddie/whatever more condescending term as been used.