Very good observation. I think my love language as far as receiving is words of affirmation. I totally broke down and cried when a minister, standing in the place of my dad, said to me, "You are a good son." This meant much more to me than when he said, "I am proud of you." As far as giving, my love language is definitely touch. I was a triplet in the womb, and we were all touching each other and got accustomed to touching and the intimacy of that before I was even born, so that has a lot to do with it. I can hardly talk to people without wanting to touch them: pat or squeeze their shoulder, hold their hand, touch their arm or face, etc. Of course, people can totally take this wrongly, especially the other gender, so I have to be careful. For me, it's not what is said in an exchange near as much as what is done in an interchange. Quality time is big for me too as far as receiving. Touch is my preferred way of relating to others; I like to 'get as close as possible' and let them know they are accepted (which is what identical twins may do in the womb with a third womb mate of a set of triplets).
What you shared about the voice and the piano strings is cool. I will try it sometime.
Yes, satan uses our 'love language' against us as every other thing. While I don't believe that each person must have one superior love language (just as one Christian can have more than two spiritual gifts to begin with and doesn't necessarily have to be more superior in a particular one), it is common sense that satan does use the good things God has created in us against us. For instance, my love language toward others is touch; my dad, who was abusive, decided he had to isolate me from my siblings. Seeing that we don't wrestle against people but against the enemy, it shouldn't be a stretch to say that the enemy is the one who was using my love language against me to harm me in the maximal way.
I agree with what you share about mental illness. I know someone right now who they say is bi-polar and manic-depressive. It didn't take long at all to ascertain that his real issue is childhood abuse, bitterness resulting from it, and low self-esteem. His manic-depression and bi-polar (his specifically) stems expressly from his self-hatred because of his abuse, not from chemical imbalances or any other such 'scientific notion'. God created us as tri-partite beings, and our souls take the weight of good and bad experiences. Out of these, we can develop all kinds of different mindsets and beliefs, including mental illnesses. I read where someone scoffed at the idea that mental illness can be tied to [matters of the soul and spirit, e.g. demonic]; but Christians should actually be front-runners in all fields of psychology since in Christ, everything that is complex (science, technology, spiritual principles, psychology, illness and disease, etc.) is made simple.