Nice looking game, made with lots of love to details however the game lacks any challenge factor. What I would like to see is:
1. Each word gives points when placed on the board. It can be different based on the length.
2. There should be a time limit to place the words on the board. If the player completed the level before the limit was reached, there are bonus points based on how much time was left.
3. If the time limit was reached, the player could decide if the game is over (the score is entered on the high score table) or it can be continued but the timer still runs and every second deducts points (that can result even with negative score).
That way the player always can complete the whole game as it is now but he/she can return to improve the score. Currently there is no reason to come back to the game when completed.