This is really good! I really like your use of very exotic scales and the unique textures you create with them. I especially like the ending, how after the big dramatic climax the rest of the orchestra fades away, leaving only the two solo instruments. I thought that was a really cool effect.
I agree with others that the cello needs more of a presence. Maybe around the 1:00 mark or so, you could adjust the waltz so that the cello gets the melody, while the oboe continues as a countermelody in the background... perhaps symbolizing the tortoise surpassing the hare?...
And as I always say, you really should spend a little time putting a score together. Not only would it make your music easier to follow, but it would make the presentation more professional. Your music is really good, and it deserves to be presented in the best light possible.
Thanks for sharing, I always look forward to your unique voice.