So I really like the chord progression!
But hearing the percussion, this really doesn't seem to cater to the ambient genre.
Okay, so the drums are a little too loud and could be EQ'd a little better (the snare needs to have a low-cut filter added to it, i.e. null out all the low end frequencies so it doesn't counter the kick drum). The open hat, which seems to be panned to the right (yuck. :P), seems to be a bit shaky. I dunno, it just sounds kinda dry, try adding some effects to it (distortion and reverb come to mind). I'm diggin' the ride though. ;)
I love the chord progression, but of course more needs to happen to even out the energy that should be going on throughout the entire frequency spectrum; you need a deep bass-line to 'glue' your track together, and a melody to give it more depth and emotion (of course not all songs start out with bass-lines and melodies, so you might already have these things in mind >_>).
Overall, this sounds like a pretty good start for a song in the classical rock genre, even if that isn't the direction you want to take it... Great job man! I hope to hear a complete version! :)