i have a small problem with this
The voices sound nice and add to the pece generally quite well, but they don't give it any specific mood, and a piece that feels moodless i find quite hard to listen to.
Think of developing it a little more, even if it is just to make it sound more tense (which it pulls off okay)
Just make it lead somewhere a little bit more i think. otherwise, nice sounds and a alright try!