Great job, I could imagine this being a great piece for some creepy movie sceen. Great job, make more :)
I think its great, first song or not :D
Personally, I didn't find it very atmospheric, but it had a pretty tense tone to it.
Not too shabby...
For your first ambient, I can see where you're going with this. Although it could be a little darker in terms of atmosphere, but that's my opinion. Good job nonetheless.