This is great! The mechanics are well tied together making fun and clever puzzles. Graphics are cute as well.
I agree with earlier commenter to make different objects more recognizable from each other. I was trying to change my size in the door opening pads. Maybe linking the doors with their openers with symbols or something would be nice as well. Just so that it isn't so hard to remember which pad opens which door. Anyways very solid stuff.
PS: I couldn't figure out... was it third level. How do you get here with bigger blob to pull this down?