It´s a pretty creative idea for the layers theme to do a game about Dj mixing.
And for sure, the effort you spent on the art is appreciated.
For the music, i would recommend you to be careful when writing a melody, try to make it more cohesive, try to repeat motifs, not to use notes too far from the other too often (on a melody), to have a stablished rhythm, to avoid the kind of stuff that makes a melody to lose it´s musical sense, but the harmony, kicks and hi-hats were nice.