It sounded great to me. Even judges in an audition want to hear people do well- unlike their names, they aren't out to judge you in a negative way. Above all, think of the music. You're giving the audience a beautiful gift- your talent of music. They'll love hearing you play, and the flute is widely regarded as one of the most beautiful instruments.
People love the sound of a great flute.
So try to keep this in mind when you perform next, and it might help you keep those nerves under control. It looks nice but does not change the tone at all. This is only found on B foot flutes as they are the only ones with a low B tone hole. The split E divides the action of the upper and lower G keys. Normally the G keys close together, in a split E mechanism, that is still true but the lower G can close when the third octave E natural is played providing ideal tone hole venting for the high E. Found mostly on professional flutes.