Hold space to go up, release to go down. Yellow portals change your gravity and blue portals reset it. The pink/green portals turn you mini/normal size respectively. Mini changes your angle of elevation from 45 degrees to 60 degrees. The portals that look like a bunch of arrows change your speed (2 arrows make you fast, 1 brings you back to normal speed, and 1 facing the left makes you slower). The triangle shaped portals are dual portals
