Thanks for playing this game. You're right, a lot of issues are still being improved.
In the beginning, the music was designed with the idea that the layers of music would be looped and stacked little by little and randomly unfolded as the characters appeared. However, due to lack of time, the best part (battles) is not the main part of the game.
I'm confident that I'll come up with more interesting compositions in the future, so please look forward to it xD