Interesting concept. I tried mapping it out, but even with that I had a hard time grasping what to do and what was happening. I think a map would be useful for this idea, and maybe even have the younger selves show up so you know where they are, and in that way help them to their goal. I did finally reach the en, but I dont think I did much more than to place the sewer in a reasonable good spot.
Anyway, Nice little game!