Fun! I was a bit confused at the end because there's no "victory" state or indication. I think I was expecting it to give me a new word pair once I got to the end, or tell me "come back tomorrow for another round"
I didn't understand what you were saying at first, but it turns out that you have to click to remove the final, single letter before the "you won" screen shows.
And I agree it would be nice if the game could detect when you've reached a dead end and notify you somehow.