There is too little content, its kind of impossible to review this other than saying this game is misleading. It should be called 'see how fast you can type the alphabet'. The only great thing about this game is the programming doesn't suck but if your just starting this is a good start.
Doesn't really innovate anything new to the site, if your just posting this here as a proof of concept then alright, but if you decided that you want to continue this i would recommend instead of random a-z that you have the player type REAL WORDS. Honestly, they have stuff like this in second grade. But i guess you did what you came to accomplish but honestly, they have "games" in school for this, and they pull it off a lot better then you.