First movement of a classical symphony

Hello,
Almost a year ago, I tried to compose the first movement of a classical symphony and I managed to complete it. I never managed to finish other movements on the one hand because I did not master classical influences enough but also because it represented a lot of work for a simple autodidact like me. I would like to know your advice and your opinions about this first movement.

Here is the video, sorry for the poor sound quality

I like this. I think your themes are strong and you provide enough variety to keep the exposition interesting.

My only critique is the development section. I think you could've really taken your material to some interesting areas. I'm not sure if the lack of development here is due to lack of orchestrational strength or -perhaps- a difficulty in imagining the possibilities of development. I'm guessing the former, more than the latter. 

All in all, nice work.

The harmonic rhythm in A" was a little bit slow for me, especially with the alto-range tonic syncopation. 

So.... The trumpet at C4 isn't going to cut like in this recording. C5 will!

Also, you're harmonically in a box. Earlier you went to Ab just for a second; that was AWESOME!!! you can expand this sooooooo much more. Just because you are writing in the style of the Classical period doesn't mean you stretch out.  F? Bb? 

5:51 I love that but come on.. BEETHOVEN'S FIFTH??!?!?!?!? booooooooooo :)  Steal from elsewhere. NOT that!

Still, great job.