Sonatina in the style of Haydn

Thanks to all the wonderful comments the last time, I was able to step up my game a bit and write a sonatine. Ever since I learned a little sonatine by Haydn in F major, I wanted to write something similar. His sonatine is so simple I could not even find a youtube video of a child willing to show it off, so what I've written below is a little bit more below. It even has a teeny tiny developement-like section with modulation in the b section.

Thank you to all those who helped me the last time. And, I hope that you will play through this to find many interesting possibilities for improvements. As this is my first original work, I expect there are many of those.