Hi Ben,
Only 14?...Wow!! Please don't tell me you started when you were 13 1/2.
Not only should you be satisfied with what you have done so far with the Concerto, but you should be PROUD of what you have done so far. I am not only impressed with your writing ability, but I am amazed at your ability to use the software so professionally after having it for such a short while. I really like the "little diddy" too. What a future is you have in front of you! Let us hear more from you as you progress. ( I agree with David. Saxophonists tremble at the thought of playing in C# also. But you can trick them by changing it to C and letting them have deal with the accidentals )
Best Wishes
Fred