When I listen to music like this I feel like going back to composing and playing. I keep listening and I imagine your composing process. Reminds me of quiet afternoons, starting off with A small idea and improvising for hours, letting myself sift in the sound of my own music, then after just picking the best parts. (I guess I just gave you confirmation of your good work: you got me all mellow and nostalgic there).
This composition is really good, it is indeed quite expressive, it conveys some emotion and it flows through some different moods. I think that perhaps a tense moment could have worked well with said flow, but it wasn't necessary, without it the song got mellow and relaxing.
These were some interesting scales and chord progressions you choosed, they don't feel either happy or sad, more like a water paint between them. Some notes seemed to have fallen out of harmony, but I had the sensation that it was intentional.
Overall it is a very good work that was done here, this song has it's way to bring me some memories.