All right, sweet minimalist piece. Since you have only two chords, it will help a lot to space and change your chord voicing, keeping in in triad at first works, but the more we listen to it the more we want to spread out. The strings is a nice idea but doing fifth with the melodies doesn't work so well, there is a bit of unvolontary dissonance in the mix. Arrangement is nice we can feel the build up. There is a lot of free strings plugins that can also help playing with modulation and expression to have a better feel of the strings.
Might seem a brutal comment but since its unranked I went all in to give my opinion, so don't be offended it seems alot but its a nice track overall.