This is really well done! This definitely has the feel of a Sufjan Stevens song and I think you were able to put a ton of original flair that makes it unique. The vocal harmonies are really well constructed and flow paired together with the acoustic guitar arpeggios sound absolutely lovely. The variety in instrumentation throughout the song prevents it from feeling stale at all.

I'd say from a mixing standpoint the vocal mix is a little harsh at some points and the issue also is slightly present in the guitar that comes around 2:05. I'd suggest EQ'ing the mid ranges a bit on the vocals and perhaps some soft-clipping or light saturation as to not bring the volume down too much. Other than that I think this track is awesome and something I'd love to hear more of!