Amazing design and implementation. The power ups and levels built around them was great and didn't overwhelm the player right off the bat.
The only part I didn't really like was when you had to do like 4 or 5 of the no-vid jumps in a row into increasingly smaller boxes. Since it goes completely blank there's no real concept of where your at so landing inside of the boxes is mostly luck until you've failed over and over and every time you go one further you had to do another harder one. This is somewhat present on all the no-vid jumps but this particular section exacerbated it a lot.