This is really nice! I think you did a great job with the overall mood in this one. I love the choice of instruments, as they really work well together to create a really nice atmosphere.
I also love how there's always something new in each part, which keeps my interest all the way to the end. Also, 2:37 is absolutely fantastic. The way those chords come in is just wonderful. It sounds very rich.
The only thing I could see being improved are the low piano chords. Putting chords that low makes it sound kinda muddy. That's just my opinion though, not necessarily a bad thing.
I think you did a really great job with this one! Keep it up man! :]