Answer 1 - You can include as many of the wildcards as you would like, or none of them. They are just an additional challenge for the jam that you can decide to do or not.
Answer 2 - It's not explicitly stated anywhere for the jam but the game you make should still be your property. GWJ does not take ownership of it from your submission. I believe this is fairly standard for game jams, you to keep ownership of the game you submit.