I like the simple colour scheme and layout - I think the simplicity of the layout allows the player's mind to wander a little in order to think of the words given by the question.
I like the variety of questions, and the prevention of a previously used answer. It would often force me to think of something else that fits the criteria. After playing a couple of times, I tended to default to the same few answers. I think more themed questions would add more variation to types of answers given, though this may be hard to program in as it may become extremely subjective.
A simple, yet frantic typing game that tests your English vocabulary.