With the description, I had to think of the Buffy the Vampire Slayer episode "Once More with Feeling" - nice concept and I love the chiptunes sound.
You have a lot of stuff going on in the background - more tracks than a retro console with that kind of soundfont would actually allow. So you are kind of breaking the illusion of retro gaming; that can be an artistic choice, but in case it isn't, you should be aware that this sounds like a modern piece of music that was made to sound retro.
A very cool piece overall, I can totally see this in a rhythm game, and you are just so enough moving beyond the limitations of a simple scale to really sell the demonic influence the game is about.