The concept is very clever!
If I had to add one thing here this would be some new mecanics put in the right level the further we go to really engage the player continuing on the next levels. because otherwise, we pretty do the same stuff.
for example : Adding the tradmill stuff was the thing that keep me going on more levels, but I couldn't finish all the levels because the next mechanic added (if there was one) didn't come early enough for me.
If i could propose a mechanic, maybe having a bloc which force the robot to jump if on it and/or a block which keep the robot without jumping if on it, independant of the first input could add some spice on the levels?
Anyway! In 4 days, it is just insane what you accomplished, because the level design are really well designed, and the difficulty progression are I think really good here!