Glass pegs are worth bonus points, 500+ for each up to 2500. You can also use the same peg as an enemy stick as long as you don't swing into each other
Take your time - no bonus for finishing fast. If you need to wait for an obstruction to move, you can keep hitting to stand still.
I have a suckish score because i haven't been going after every point i can get but i just got to level 23 and omg that is hell, crazy hard, looking at least haven't tried it yet XD