I don't know how much of this is just that I'm terrible at platformers, but I found the controls a little bit janky and the camera a bit too twitchy for the level of precision needed for some of the jumps for this game, and it also felt a bit buggy in places - the level didn't always reset properly when I fell, and at one point I got "you crushed a wall" as my death comment when I'd just missed a jump - maybe I accidentally went out of bounds? - and then the menu wouldn't go away even though the level reset.
But all that being said, when I figured out how to combine the size changing mechanics with my jumps, man it was satisfying when I did nail them!