To take a promo code, you should have to have an account and pm the dev.
Lurkers take promo codes and dont have the nerve to leave a reply. In my opinion, you should at least contact the dev. The whole reason of promo codes should be to test out a game for the dev and give suggestions. So maybe, restrict the promo code and contest forum to people that have accounts? Sorry, just irks me to see promo codes disappear and no one even replies. >:|