Controlling the character is difficult . . . it seems "slippery" and that makes it hard to achieve the precision movements that a platformer demands.
That is a clear choice for the developer because it makes you want to go faster. It makes the game feel amazing when you are speedrunning it and the game is designed for that with (almost) every obstacle overcomable if you do the right buttonpresses at the right time. Basicly if you do everything perfectly you will never have to stop.