the new update is very cool. But since you did your side of the deal, i'll do mine.
So basically to do the glitch i grappled (left mouse button) on one of the walls or celling, and while still left clicking i restarted the level (R), and when you restart the level, the timer only starts when you press a button in that run, but since i left clicked on my previous run it doesn't register it, so now i stop holding the R button and im now flying to that wall. The 1st, 3rd and 4th levels are the biggest examples of using this glitch good