This could be really cool as soundtrack music. A couple notes.
1. That background synth (bass/humming thing?) is really overwhelming the mix the in the 200-500hz range. If you EQ that down a tad, I think that'd go a long way.
2. That plucking (guitar?) there are couple chords that sound off and aren't landing right (@1:06 and 1:28 and 1:36, 1:37)
If you play around with those two things, you'd take it from a 3.5 to a 4.
But otherwise, really cool and moody atmosphere.