This deserves to be in some kind of horror short or game. Very ominous and eery, these drones are a perfect fit for this. The kind of drum pattern which you are using here reminds me a lot of a 90s drumloop from the Distorted Reality sample CD. You should really give the OST of Rayman 2 a listen some time, some of your ambient tracks remind me so much of the work of Eric Chevalier on the Rayman 2 OST.
Great use of percussion in combination with the synths. Not a huge fan of the distorted part around 03:33, but the advent of business around 04:00 and later adds to the 'storyline' in this piece of a chaotic and unknown path which leads to strange ways and an unexpected journey.
That hi-hat effect around 04:45 is very nice.
Where did you get the bird samples from? Fadeout and outro work great.
Magnificent piece.