Great visuals and ideas
I really liked how you patched the individual elements in here to really flow along with the title and main themes. Brilliant work!
The intro has a lot of character, with the detuned, dark sounding piano with a subtle, but powerful melody and the eerie ambient textures (may I ask how you make these? or do you find or sample them from something? I've been trying to make a lot of experimental stuff lately, and you are a huge inspiration :D ). It would work really well while a shady character is staring down the hole, about to venture right down.
I appreciate the drum buildup with you including the acoustic toms so the heavy beat doesnt come into suddenly. But when it came in, it sounded like a classic snayk track :) Great distorted, glitchy industrial sound with a very interesting beat. Every piece sounds like it is carefully placed so the beat isnt too random or sporadic (which is easy to do when including glitch FX). Love the retriggering and reverse effects!
The ending is quite suitable- although it does sound similar to the intro so may I suggest that you include one more melody on the piano (in an even higher octave register would add more creepiness methinks) to kind of build it back into the intro and add another element.
Great job as always snayk, I hope to see this get used in an experimental style flash (like Catoblepas') !