Trashtalk's Hacking Minigame

This is a line-drawing puzzle game inspired by Professor Layton among other puzzle games. The goal is to connect all nodes in a level while not overloading them. Test your skill against 40 (!), semi-well-designed levels and be sure to take regular breaks and such.

This is a prototype, so please let me know what you think of it! The levels are not ordered in increasing difficulty, so I would be very interested to know which level you found the hardest. Any other critique and commentary would also be very appreciated.