there will be better coders than me, ready to "critique" my work.

You're the one who did it. That's the first point working very strong for you. You did it in public and you are the one who won the proposal race.
Now it's time the other coders to check up your work. If they will do it, be happy. Maybe you will get some hints. Be happy. Maybe you will get no resonance and your coding will be ignored. No problem, the work can go on. But they paied for your work. Something will happen now. So stay tensed, but relax. I don't know how to do this but you will find a way to become a real leader of the pack.