I liked the little camera shake, added a lot of impact to submitting my math homework
I see that moving the submit button has a lot of controversy, and I'd say I agree with the masses, especially since the text and submit boxes can overlap and create problems, but I think it wasn't the worst decision since you only made this game in a few hours and wanted it to be extra difficult. It is still holding up to the name of "complicating simple math."
This music is also a little simple, but it is nice to listen to and is very fitting for the game since it is both tense and unobtrusive, meaning that it doesn't interrupt people from thinking about math but still adds to the experience.
(New high score let's goooo)