This was a fun game, I liked the idea of freehand loops drawn by the mouse as a solution to the puzzles with the added challenge of ensuring the line was the correct length. It seemed like the best idea was to keep all of your lines as straight as possible up to each block and your loops tight so that you could waste your length just before B and get exactly the right length. Some music would have been a bonus but its understandable that you weren't trying to go for that rating criteria when there is very little time in a game jam.
Overall a fun game with good potential.