The goal is to allow marbles released from the generator to flow to the collector. However, the path is broken. You can click on sections of the path to rotate them by 90 degrees. You must do this to each broken segment until the path is contiguous. But you'll have to hurry before the time runs out.
When you are finished repairing the break, you can release the marbles to circulate through your machine. You will either watch with pride as it successfully distributes the marbles, or watch in disappointment as an incorrectly built machine smashes its cargo into bits.