Hi, I'm here to help.
You are releasing a secondary version of the game you've just made. You will find it helpful if you go into your newgrounds gold menu and delete the previous flash, or simply upload the modified version into the old one's place. This can be achieved by clicking into your submissions and editing the uploaded file. It may be best to take the secondary one and delete this, and let the users that reviewed your first submission know that you've updated it by clicking respond to your reviews.
Have a nice day.
Jonas
NG Moderator.