Congrats on your first game jam entry! I like about the automatic jumping that it can be used to as an air-jump with proper timing.
Some advice on the licensing: I am not a lawyer, but it is probably better to use music with a free license for future projects. Nintendo in particular is known to be very strict with copyright. It's not a big deal and Nintendo won't care this time, but it's still something to keep in mind for the future.