Contact form with keyboard accessible inputs

I worked hard to use semantical HTML for each of the form elements so that I could take advantage of the built-in interactivity and accessibility that come alongside those elements. Because of that approach, the form is fully keyboard accessible, and I hope it would be just as accessible to screen readers and other kinds of assistive technologies as well. I would love to hear if others feel there is some aspect to accessibility that I have not considered or that wouldn't be effectively accommodated in this solution.