I like the textures you used in Ancient Cistern with the reversed synths, woodblocks, and more! I think you could have added a brighter texture or a melody that sits less in the mids and bass to make it sound less muddy. The harmony design could be more interesting too, as it feels like it's droning between 1-2 chords. I like how you brought up elements like the reversed synths in the final boss, with more drum "footstep"-like sounds, adding to that intimidation. Besides that, there isn't enough intensity in this track until it picks up a bit in the middle with the two harmonizing synth lines. I think a more active melody with more driving drums or a groove could heighten the intensity. Also, try to play more with chords and modes to add more harmonic interest and development. Nice job on the first jam!