Needs lots more
First of all, why does it say "realistic"? Nothing is realistic in that game (and not talking about aliens or that, I'm talking of how the bodies react). They shouldn't fall in pieces, they should fly around like ragdolls. And occasionally break something if the shock is too hard.
Secondly, more options would be nice(r). The levels get too boring, and even if gets more difficult the more you progress, the less you actually want to try.