It's really smooth, especially in the start; you wove the sample(s) in well. One thing, though, that I wonder about: is the sample material in the same key as what you've written? The lead bass coming in over the sample seems really harsh compared to how you started. By the time the song gets going, though, the track is certainly eerie. Very chill as it continues. I like the vocal you eventually come in with; maybe you could put it in once earlier as well? At about 5:45 I'm starting to feel like the song could/should be over really soon. The wubs at 6:00 are interesting, but I kinda feel like you're introducing them (where they in before?) just to have them. I can see how you want the song to wind down; maybe you could cut out a bit of repetition in the middle to move us along a bit quicker.
Overall, though, it's a great track with a solid mix.