not sure if this is what u meant, but i made it a bit smoother , and added 1 extra line to destroy the links when is outside the bottom viewport, so it makes it less weight on ur spring. u did not had angular damping right as long as density. just play with those to make it as u want for now i guess its good, if that is what u looking for, however when u press down the spikes still happen until u stop. also u had some events lined wrong, remember c2 reads from top to bottom, so if u put lets say (on collision with wall, destroy then under u say add points) the add points action wont happen since the actor u destroyed it.
[attachment=0:1dk5im4m] if u change it the game will do the spikes again.