it's really difficult but I figured it out!
you can jump on the gravity slider then use the camera slider to shrink and grow yourself.
Thanks! I found the tutorial after trying to speedrun for a few times, I think it's fairly well-hidden since the player is immediately told to hold right
also I didn't know that jumping gives you a little speedboost, that's really interesting! I did use a small clip at 0:08 of the video but it doesn't save that much time