Cut the rope so the saw comes swinging down and breaks the square chain holding the candies. Once they have separated, pop the one with the bubble at the right moment so that the saw (while swinging) so the candy falls in to the on Om Nom. Then while the other chain is swinging, time the cut of the rope holding the saw, so that chain cuts at the right moment, feeding the Om Nom.
Cut the first red rope. The saw will go shooting out and cut the chain, feeding both Om Noms.
On the left hand side, cut the rope below the saw, so that saw goes floating up. Once the saw has floated up to the middle, pop the bubble and then cut the rope, so it splits both chains and both candies are hanging on ropes. Cut both ropes to feed the Om Noms.