Beautiful track, I like it! And to give the track more depth I'd put one more pad in, set it on LP/HP and play with the spacing knob to get a more "spacey" sound and maybe add more drums at the end (;
The first half seems to lack some feeling. The second half adds feeling to the song. Maybe add one more sound to the beginning that isn't in the second half, to make the first half a bit different from the second. Just an idea though.