Good idea! It would be much better if you add a final event when you complete successfully the game. I can still writing words and words and it looks like I have missed the target of the game ;)
It will stop adding rows once you reach a solution. But the logic for stopping wasn't great, and it was breaking under some use cases if you went back and changed letters. It should be more robust now, and I've improved the congrats-you're-done messages.