This seems like an interesting idea but the execution is sadly lacking. I am simply unable to effectively move letters around given the amount of time you allotted for each round. The end of a game seems arbitrary at this point, even though I know it can't be. Sometimes a game lasts three rounds, sometimes six.
Maybe I'm not smart enough to understand the mechanics of how to make a word. I'd like to see this developed further, it could be fun, but at this point it's not.