Have to agree with Deádric336 on the melody. For me the melody part did not really feel like a proper melody as it just worked as part of the harmony with held notes for the duration of the chords. I would've liked to have more melodic movement on it to give it a shape and rhythm to really make it melodic and memorable,
But other than that, really nice vibe, almost feels like a souls like game boss fight with the choir and organ and the dramatic chord stabs.
Good work!