I think that would be okay, if you didn't add to the game on the day you submit it. Say, for instance, you want to participate on day one. You would be able to submit it that day, as long as you worked on it within the same time limit as you normally would, instead of working on it an extra day, just work on it the day before, but submit the file without changing it on submission day. please forgive my Ingrish.