Not too bad at all.
Some technical points tho, hope you don't mind me raising them:
Not sure about the double-stops for the bassoon... (bar 5) they might be difficult.
Do you intend 2 bassoons (as you do clarinets later on).
2) The double-stops for violin in bars 2, 4 & 6 are impossible to play.
3) The bassoon(s) and cello, bars 15& 16, forming a root triad in E-flat will sound horribly muddy in an ensemble this size. Fine, if you want that effect but I can't believe Mozart would do that.
4) Similar in bars 1 & 3 and elsewhere, the double-stops for cello with the bassoon playing a chord like that isn't very mozart. WIth the right kind of light staccato it'll probably sound more like a series of thuds in real life!
If you mean >1 clarinet/bassoon, you need extra instructions to show which is playing during "unison" passages - 1, 2 or unis.
But basically the composition is fine - not awfully like Mozart though, mostly because of the scoring. Passages like the duet for clarinets (starts p2) is fairly weak and univentive because of the way you've scored it. Others, indeed you, might think differently - well, you're the composer so your word is where it's at!
Hope this helps.
M