I wish you had used the allegory as part of the story, rather than use the story as part of the allegory!!
Otherwise it is well constructed to finally lay bare the meaning. I agree with @okusarobert on that last line.(Finally, we've killed the last cockroach)
Thanks, will definitely do that on my next piece. Always fun to experiment with different kinds of writing and very feedback from others.
True. Thanks mate! Have you read some of my own? I prefer to vary as well, either theme or style.