Note: In this tunnel, since you can only use the Duplicator and the Child in this tunnel at first, so the character suggestion's choices will only be the Duplicator and the Child.
Take advantage of the ramps, and jump off them as the Child. You could use the Duplicator and jump off a duplicate if you miss a jump. This level is not very difficult, and you should win with about 10 tries or less.
Under special circumstances where you are in a gap away from any tiles completely, which can happen given the platform distance, you may have to spam the jump button to jump off duplicates the second you create one.