I was corporating with the music with someone else for this game. I have received the music but it was just a few hours ago so it was to late to be included in the jam. I will make a new build of the game alter with music and sound effect (when the judge has casted their votes).
Regarding the levels then one of my own goals was creating some good quality levels instead of many bad once (Less is more). It sounds like I was successful. But you are right. It is a bit short and I should improve it.