I would say the most fun parts of the levels were building up speed and trying to keep my momentum going, but sometimes there were some precision platforming parts like the level where you jump on the tops of the cylinders, those parts interrupted my flow a little so I would swap parts like that out with more momentum-based platforming.
It always felt very rewarding getting to those speed boost tiles, I thought it would be cool though if there were some more obstacles to avoid when you got to high speed, at the moment some parts feel quite easy at that point (not necessarily a bad thing all the time though since it makes you feel cool).