This is definitely a song for a villain that is unpredictable! Your heavy bass and cymbal-heavy drums with the occasional brass blast make this fit the “larger than life” theme well. The monophonic nature of the piece adds to the unpredictability since, as you describe, the lack of harmony makes finding a tonal center challenging for the ears, but I think when used deliberately, this technique accomplishes your goal of unsettling the listener well. Thank you for sharing!