Yeah, I also take game jams as opportunity to learn something new. Every game jam I try do something I never did before. This jam had quite a lot of stuff in it. Character creator, Tutorial, Dialogue System, Story, Level design, advanced 2D Platformer.
I'm the wrong guy to ask for music because that's the thing I'm the worst at :D But if you are looking for sound effects, I can recommend this website https://sfbgames.com/chiptone/ or have a look at https://www.youtube.com/watch?v=MjusZESiLiw.
If you want to try out making sounds https://boscaceoil.net/ is quite ok, but the program is buggy and can crash without warning...
Yeah, I will follow you so that I stay updated about your game ;)