Beaauutiful. It got a nice and soothinng sound and the melody is so nice and relaxing.
I do, though, have one single complaint about it :/. The instrument that comes in at around 1:50 dosen't really fit with the piano and the synth that comes in at 2:25. It just sounds out of place. Hard to explain it but I think an instrument that gave off more of a steel drum-ish sound would be better. That's just my opinion though.
The rest of the song is awesome and I love how good you vary the song as it progresses. You always add something new to every part of the song. the second half of the song that started around the 3 min mark was probably my favourite thing with the song :).
I'll give you a 4.5 rating.