Your devlog reflects the tough but necessary decisions game developers often have to make when deadlines approach. It's commendable that you chose to prioritize the overall design and functionality of the demo over aspects like music and sound effects, especially considering the importance of showcasing your work to classmates and teachers. This strategic prioritization is a crucial skill in game development, where scope and resources are always in flux.
My advice would be to explore minimalist or creative solutions to partially offset the absence of music and sound effects. Even basic sounds can significantly enhance the player's immersion and the game's atmosphere.