I'm making some radical changes that I never really thought about until someone mentioned it, regarding the bonus round. It will make the experience so much better and it should be ready in less than an hour.
EDIT: Okay, so I've pretty much done a major overhaul of the endgame. In the bonus rounds, you can now indicate correct and incorrect guesses with lights, dimming and sounds! To illuminate one of the bulbs to indicate a correctly-guessed word, simply use your favorite “advance” technique (mouse click, etc.). To turn off a bulb due to an invalid clue, pass or exhaustion of clues, click that bulb, starting with the right-most bulb.