This is great! I like the piranhas chomping on the bottom of your boat.
Great art style here!
Of course! These entries are yours to do with as you like :D.
The submission time is to ensure that you have a tight time constraint to get a complete, playable game out along with your fellow jammers. That way people can also start playing and rating the games that go up. If you want to keep improving your game or its page afterwards you should, though your ratings may happen before you make those changes.
If you didn't get uploaded in time, drop your game link below. Make sure the game is live (change the bottom setting on the game page from DRAFT to PUBLISHED). I'll send you a submission code for late subs!