Rik,
Good effort, I am not sure the song is too busy, I think you just need to get the piano and guitar into their own spaces. The piano sound is not great, sounds a little like a toy piano and very small. (Janet- it's not the playing, just the sound. The playing is really good). Assuming that you have the piano part in MIDI format, if you changed the sound to something like Vienna Concert Piano, or something equivalent, it would make a huge difference with nothing else changing. The piece is very good and uplifting/inspiring. I wouldn't change a thing except that piano sound. The strings are really good too.
Regards