I'm not a fan of any in-game music, wasted effort on any game. Sliding down & jumping up the walls is great movement action. Good perspective to see just enough ahead.
I always feel like it's better to have the option for music, even if it's not the best, especially since you have the option to turn it off. I'm glad you like the movement, as well as the player perspective! I purposefully spent some time fine tuning it so that you had enough time to react to incoming enemies.