I agree! Something I would have loved to do (but ran out of time) was to add some kind of difficulty menu to the game as well. Maybe an easier difficulty for starting out, or a more difficult one if the player wants a challenge - or similarly, if a person struggles solo but does well with a friend, or does well in solo but struggles with a friend, it would have been nice to be able to adjust the difficulty too.
Something I will definitely keep in mind for the next game jam!