I'm stuck on "The Storm". I can dodge all the stuff that gets thrown at me, but I have difficulty with the sections where you're supposed to press the left and right arrows rapidly. I can get past some of them, but there are others where I seem to die before I even get started. I've tried going back and forth as fast as I can, mashing them together, different speeds, and nothing seems to work. Is there a penalty for hitting the left arrow while the right one is still depressed?