Pretty Good
For some reason the melody itself reminds me of something out of Still Alive, from Mirrors Edge (Not Portal). The sound, however, sounds like an 80's style synthesizer (in sound, not quality, which isn't a bad thing in itself) and i'm not the most fond of it.
I like pianos. The Piano interlude in this one was good. My reccomendation; make the instruments gentler and softer, use more piano. The actual song is great, but you might want to make the false-ending a little less tricking, like a with a lingering note (I was about to mention it was too short when it came back).
Anyway, great work, particularly for your first delve into a genre.