Why hello there! Below you find my feedback on your sonata. It will be dived into the following sections: Musical form, Harmony, and melodic form.
First movement:
In the first two measures, you have established the primary theme of the exposition, and it seems you are writing in sentence form? If so, then there are some minor improvements you can do. In measure two, maybe, you can have dominant harmony underneath the contrasting idea. That way, in measure 3-4 you can progress from V-I.
Now after that, you need a transition. Here you need a way to modulate to the new tonal region(III, VI, or IV). Once you have established this, you will either need to provide a MC or deny it. To me, you have it!
Now, after that, you should have secondary theme. To me, this where I am bit lost. Is there a reason why you repeated the first theme? Cause to me, you are lacking secondary theme, and codetta.
The devolvement is off to a great start, but once you have more material it will be better. Then you have recap...