Wow, the contraptions you can make just by pushing around the jellies are incredible! It takes a while to get used to thinking about half-tiles, but once you do, it's a mind-boggling game of setting up scaffolding using level geometry and making the right tool for the job. 

My only complaint is that one of the edge-case mechanics (in the level before Tight Corner, I believe) was never taught in isolation, and without it, the solution always seems just out of reach, even if you've essentially solved it.