Thank you for your kind words!
Unfortunately, we didn't create the music ourselves, as neither of us is particularly musically talented. I always try to choose tracks that fit the experience as well as possible. (The music is from Pixabay.)
Sound effects would definitely have been nice to have. I originally wanted to include quite a lot of them, but unfortunately, I ran out of time.
Skipping the intro is a great idea...
It actually crossed my mind early on, but at that point, the code was still too messy for me to implement it. By the end, I had completely forgotten about it. On top of that, intro skipping was already implemented in the code as a developer tool. It would have literally taken just one line of code to make it available to players.