Oh my fricking' god that pulse is totally freakingly annoying to control. I've been trying a certain area over a gazillion times and I still cannot get it right. It's probably just me but I would seriously reconsider making it a little more predictable or less hard (or maybe I should've played the game on easy instead of hard... ). The only reason I'm still trying is that the game is so awesomely styled, both visually as sound-wise. So take that as a compliment, seriously original style!
Btw. I'm stuck in that area where you have to virus-dodge-jump-pulse across a lot of purple stuff. First right, then down, then left again.