I love music based games and was really excited to see how composing your own song would factor into this game, but unfortunately, I couldn't get anywhere due to being unable to walk right. Unfortunately Nandini, I can't really recommend anything related to programming since I have no idea what the code looks like, making me unable to pinpoint why I wouldn't be able to walk right. All I can say is, keep at it and you'll get to where you want to be! Congrats on your very first game jam! (Coming from a first timer as well)
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Sorry, I know the moving part is a little hard to understand, but here are the instructions I posted them in another comment. Instruction = Hold shift and press M to open Music Staff, keep holding down shift, and press Q up to 4 times, and press M again while holding down the shift button, this will help you acquire movements like jump and moving right.