Careful with the use of inversions. 1st inversion like the 3rd chord you used normally sounds unstable compared to the root position chords, especially since it wasn't used in any stepwise motion.
The chord at :39 is really out of place to me, mostly because of the iim6 that you have with the stepwise motion in the melody.
1:32 was a VII6 chord which would be okay normally, but I don't think it sounds particularly resolved with the next chord. I think you can use this time for a little bit more motion in the accompaniment (even just quarter notes) to support it a little better.
1:42, use of tonic pedal in the soprano voices was a cool idea.
I also see the cinematic nature of the music, and would suggest you use a VI chord at least once, because it works really well with your main melody because it creates. VI∆7 chord, and is stepwise to the tonic with inversion modulation (i.e. the 5th becomes to root) which is used in cinema music as a really hopeful and driving sensation.
Overall, you have the idea of ambience nailed down, there are just some moments that took me out.