As promised.
You really captured the feel in this song good, and the composition is great. Neat job:) The piano stands off a bit bland against the rest of the song though, and the hihats overpower the bassdrum. Try EQ'ing the bassdrum more in the low ends and the hihats in the high ends, it makes the bassdrum stand out more, and the hihats crispier.
The arp in the background is good, but the song is a bit repetitive overall.. When the piano fades away for a moment, I think that is a good place to keep that piano away for a moment and build further on that part of the song. The song is also loopable, sort of:)
To what you said with the build up near the end of the song, you can let the arp filter in with an automation clip there. Try it, the effect is neat:) And add another piano counter melody, that follows the same chord progression ( I don't know if you used one deliberately, but well, chord progressions are sooo amazingly handy.) Try it, it might give you a bit of things you can build on with this song with, and I definitely think you should build this one, because this can easily be a full length trance mix with the right changes.
Good job, and keep it up!
-RES