The melody and harmony here is nice, and this is a very unique composition that I adore. Major props and kudos for having so it be so distinct.

However, the synth at the end threw me off, it sounds way too distorted to fit it in with the rest of the mix.
Either add a lowpass filter, or use another synth. A square wave with a lowpass filter could be a good option. The synth you used is the kind of synth sound you use in rock and metal chiptune music, not in ambient music.

I really enjoyed this one overall though, once again great job.

Very sweet piano piece and strings, super emotional playing, Noire is a great pluging, the synth at 3:45 caught me off guard completely it seems out of place but I liked it maybe add a touch of reverb on it would be cool, I don't know if the little dissonance on your piano playing was just happy accidents or you messing up a little bit but it adds a little something to the more standard chords, Also your track is mainly in C Dorian most of the time.

I really liked this one from a compositional point of view, it's really lovely. 
I feel the other intruments don't blend that well with the piano. I think it's a mix/master thing.
Good work overall.

The mixing is a bit harsh, a little over compressed on the piano end and it doesn't quite seem like the piano and violin are in sync entire. It's not a bad track at all but it's also far from ambient and is seemingly just four minutes of the same melodies with a random saw wave hit at the end.

Not bad at all though, just could have used a lot more work in the mixing side of things.