Soothing.
The synths you use has a very calming effect, especially when it's in appegio. The song itself is generally quite smooth despite certain loud parts kicking in. I think the song could've used a little more percussion in the background (softly, of course) though.
I could've suggested you to use a little more instruments because the whole song sounds plain due to limited timbre....but that's just a definition of your song--gray, right? :)