It's repetitive, but in a nice way! It changes just enough every time to keep it interesting, but the samey-ness of the track instills a feeling of familiarity and calmness. It's a compelling contrast to the intensity that persists through most of the song, kind of creating this calm-intense atmosphere. I also like the instruments you picked, they added a moody layer of sorts to the song. Great stuff, keep it coming :D