Not bad, but it stays at too consistent a difficulty level. A fast typist like me (100 wpm) will have no problem keeping up with even the longest words available at the Very Hard level. As the game progresses, words should come in with more frequency, not just slightly longer words coming in at the same rate. I tried for several minutes on Very Hard and wasn't shot once.
Overall though, it's still fun, but without an acceleration of difficulty, I could probably play indefinitely.
Went from three stars to four just because of the continue button. (More game developers should take note of this. I'm not interested in score, just in trying to beat the game.) Otherwise, interesting and difficult game.
Game is not real solid for replay value perhaps, but it is original and that's something that's sorely lacking in many casual Flash games these days. Good work.