You did a really good job. I can see you updated the README and added License file too, nice job. You don't really need to combine several licenses, one is more than sufficient. For games and things like this, the MIT license you chose is perfect.
The feedback I give is for future implementation is you like, you did a good job on getting your game to this point for the game jam. Well done and wishing you all the best with future projects and jams.