The voices themselves were decent, and you show good control over them. I'm also a sucker for dry humor, but if I had to be critical on something, it seemed like there was too much "space" in between the sentences of each character. It almost seemed like someone paused it for a half a second and then played it again, which sort of disrupted the flow of it.
Other then that, I'd say it was swell and fun to hear. Good luck in the competition!