You truly are the master of Garageband ambience and atmosphere! :D You should be writing ambient background music for a game. Seriously.
That intro sets things off really ominously! Songs like this are really good at showing atonality at its best, since the atonality is an integral part to the atmosphere of the piece! I love the way the pads mesh together to - WHOA! Drums?! Where did those come from? And then the track takes a completely different direction from what I expected, into an atonal groove over a spooky background! I honestly thought this would be another one of your masterful ambiences, but it grew into huge, energetic climax of intense synths! Niiiice. :)
Compositionally, I think this song is awesome. Sure, the intro dragged on a bit compared to the high-intensity levels of the second half of the song, but I am loving that ending. All the different layers, the suspenseful melodies, it all just works and turns into what I think is my favorite buildup ever from you! :D Can I also mention that I love it when you write melodic transitions? Because I love it when you do that. I think you had a great one in Terrified, and the transition from 2:34-2:38 is just so cool.
If I were to nitpick a bit of stuff, I'd say that your sound design on synthesizers was amazing. However, your sound design on some of your more ethnic instruments wasn't as amazing - the plucky instrument introduced at 2:04 (mandolin...?) that also plays during the latter parts of the song plays a bit too fast and a bit too uniform, so instead of adding to the ambience, it sort of distracts the listener and becomes a little jarring. Same with the monotony of the instrument that comes in at 2:19 (bagpipes...?). It's just a little too shrill to justify it in that section. However, I will admit that I like all of the effects that the different instruments added to the ending, since it was just this giant clutterfunk of amazing sounds that were dissonant but somehow blended so well with each other!
Great job! Amazing buildup, synths, and props for not being as atonal or ambient as the intro led me to believe XD Keep it up! :)