I was just looking on google for MLB Umpire tests/quizzes (because I am thinking about an MLB umpire as a career) so this great to test myself. I was not expecting anything fancy but didn't expect to find something like this. When it first loaded it didn't look like anything special but it was really good. Similar to what larrymeesh said, I suggest you add the pitcher have a glove, the batter have a bat. I also recommend you try and make a background what resembles a MLB stadium and add dirt, grass and fielders. (I understand this will be hard so something basic along these lines will do. Also make the information box a bit smaller. Otherwise this is amazing.
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As a note for someone taking this serious, there are no curves in the game nor air resistance. At the moment of the pitch the ball is given a force.