Pretty nice.

Really nice atmosphere.
I like the vocal sample alot.You did well with limited samples.
Only complain is that it gets a bit repetitive.Other than that i like it alot.
Has a nice ambient feel to it.I don't know what to suggest knowing that you've only got a couple of dozen of samples.The ambiance of the track is great.Just work on the variation of the bass.Maybe add some parts with the bassline being filtered.Maybe some HP filter sweeps would be nice.Also would suggest processing your bass into a sine wave sounding sub and resampling it.Maybe some LP filter and a wave shaper could do the effect.Another suggestion is using the synth you introduced in the begging with a higher reverb and a delay once in a while (maybe each 16 bars...don't know really).Guess there aren't alot of drum and percussion samples available but try adding more if its possible.Since the bass is simple (but nice) try creating more flowing drums.
That's all i can suggest.I hope i was of some use.Keep up the good work.

9/10 5/5 :)