I like the allegory, and how well you hem and hew it.
You didn't have to reveal it in this last line though, in my opinion
Finally, we've killed the last cockroach
I would have preferred you retain its mystery and allow us 'think it out! Because you had already done a great job leading the reader to that conclusion, not least because you included a picture!!.
Cheers!
That's a great point, I was worried that the message would not get across. As I was writing I wanted to shout, 'I'm a cockroach'. So I guess that feeling oozed out on to my piece.
Hahahah...I understand. You certainly were wholly into the action yourself!! Cheers!