Movement felt realy nice and responsive!
I see that you went with 'sticky wall' and used it as a mechanic :P
Scaling felt good but I did not see a purpouse of the middle size.
I either went super big for high jumps and faster movement or super small for squeezing in tight spaces.
Maybe adding different mechanic for each size would solve this issue and make the game a little more interesting ;)
Overall cool short game with clear goal and well executed theme mechanic.