Right off the bat let me tell you that my High Scores were, Easy: 46, Medium: 12, Hard: 17. With that said let me also say that you should add a high score list. I think that there are sites that will host those for free. For some reason hard was easier than medium for me. I am not sure why.
Graphics: 5 I gave you a 5 because while they did look nice they were pretty basic and couldn't have been to hard to make.
Style: 8 I give you an 8 because I like the idea of having something to do with something that was somewhat academic being fun.
Sound: 4 The music got annoying pretty quick.
Interactivity: 6 While the whole game was on interactivity it would have been better if there was a way to hit the help button without the mouse and without having to reclick the cursor back into the typing area. If you could find a way to get rid of the mouse in the game all together it would be awesome.
Overall: 7 It was a fun game that is all I really have to say. I can't really think of anything else to add other than what I already talked about. I would make it like in Medium though if the country is two words keep the letters in their respective words. With Hard though leave it the way it is.