Nice music, very happy feeling. Good job on that, it's much less natural for people to write happy music.
You said in your notes you were looking to make it sound wide and full so I've got some tips for you on that. :)
- Use bass in the centre to keep the focus of the song and make sure the much more powerful bass doesn't unbalance the song (this isn't the case here, just point it out for future reference)
- It is indeed "wide" but only certain parts, most of it I found to be very narrow sounding. You could try panning the instruments even more, or using a space enhancer on the master to make it wider (make sure you do that correctly as some frequencies really need to stay in the middle). If you have money to spare, try Ozone 5 for mastering. If you don't have spare money, try Melda's plugins. Many of them are free and they're all pretty damn good.
- Classical/orchestral music tends to sound so "wide" because of where the instruments are placed on the stage. Research a little into where everything is placed and why, this may help you in future classical pieces.
Good job!