It does seem really short and a little repetitive, but I promise you, that issue is only fixed by experience. Play around, and study with more ambient music tracks and you'll get the hang of it. Learn from David Wise, as he composed the soundtrack for Donkey Kong Country and so many other experiences, and his music really makes an impact on the situation. It also sounds a lot like Ecco The Dolphin, and I understand where you were coming from. It's really, really nice, and I advise you further your knowledge with other people helping you. Have a good day!