But to clarify, what I meant with "I can't go left', that's relative to the surroundings. So in level 5 I sometimes have to "wait" for one of those blue vertical beams to open to let me pass. Then I just press left and my ship stays in place relative to the beam and everything else, because it scrolls that fast.
I never notice any difference, no matter how many S blocks I pick up. That's why I was doubting it.