ASCENSION frames mental illness as a dark and sinister force from the stars. It makes the behavior understandable on some level. The person you know and love isn’t doing these terrible things. It’s that dark entity. That thing.
In a SciFi film, every detail becomes part of the atmosphere creating this previously unknown place. Maybe its an alien world, like in James Horner’s score for Aliens, maybe its a new understanding of ourself like in Shane Carruth’s own score for Primer, but in a SciFi film, when the director is asking the audience to take a leap of faith with them into some mysterious territory, score must do much more than just be an audible backdrop for the dialogue.