Annoyingly just about luck. Your score will be determined only on how easy levels you get, since the harder ones are impossible. These harder levels where all the wires overlap at one specific point, are impossible. Tried taking a screenshot and solving it in peace, still don't know which one would have been correct.
To make it better, the wires should bend nicely, not make zigzags. Because if the sharp turn of a zigzag is under another wire(s), the level will be impossible.