My future-self just sent me a message that there shall be a **one hour grace period** for you to quickly playtest your game and fix any game breaking bugs, make sure to upload the correct files, check that everything's working as intended, and to let those who did not submit on *time* to submit.
This is because my future-self said he had to stay up until 2am to manage those whose game is unplayable and those who did not submit on time. (actually happened in B&W Jam) Because of the added time, any request for late submissions and to update game files will likely be rejected. So please double check.