These are nice. Very refreshing to hear classical work every now and then. As a small suggestion I found it a bit crowded at times with so many themes at once. Try to come up with a main theme and develop it gradually. Definitely a lot of great musical ideas there.
Also, I enjoy music with my ears, not my eyes. You might save some time by using a DAW next time. That will also allow you to give some more expression to the instruments.
Thanks for participating and sharing! (And relax. No one is going to steal your work, and if so, you should be flattered that your music is worth stealing!)