Nothing pastoral about it.
If I had to nitpick, which I often do for the sake of (hopefully) giving people something to think about to maybe improve for the future-- I think you need to use a bit of the EQ, if that makes sense, you have the little piano-ish part up higher in the later half, but other than that, it's all low rumble except for those occasional sweeps, and those sweeps start to all sound the same after a while. Let me put it this way: Through my laptop speakers all I heard was vague/muddy hum and the sweeps, I had to put on headphones to pick up on what was going on. Also, I think it takes a bit too long to "get going," but that's just me.
Having said that, I think you nailed the forboding mood you were going for, and would totally work in a game where it's just background (as opposed to this setting where I'm listening to it semi-carefully for the sake of giving feedback). It's obvious when I put on headphones and listened to what you had going in that low end that you did put real thought and effort into all that bass-y stuff. Love that you don't end on tonic. Good job.