these may be obvious but i'll just dump them here
the shovel still does damage when you're down. that's how you can kill fast
animals make different sounds when they die from a ko. that's how you know they are dead
you dont have to jump kick every weapon. just do one punch, then move or roll away (jump kick nunchuks still)
to have a better chance of punching someone, you need to aim to where you expect them to move. i also aim slightly to the left to center my arm
hitting with full stamina does the most damage and it seems to knock out for longer, so dont waste it on running and rest between hits
dont forget that you can always jump kick, when using a projectile weapon, to attack or avoid being attacked