I love this game. It's relatively original (if not particularly), and I actually found it extremely enjoyable to play. I'd intended to play a couple of rounds before rating, but I was hooked pretty much straight away.
However, I do have one slight problem with it, which is what has cost your game that final half star. I just can't agree with the scoring system. I like the scoring based on letters, and the bonus for finding all the words is rather lovely, and a nice way to reward a player for going to that much effort. However, I simply can't agree with the lack of a bonus, for solving the 9-letter word straight away. I managed this once or twice, and it felt, to me, like quite an achievement. However, your scoring system did not take this possibility into account, and as such, it seems to penalise the player for this achievement.
In short, almost entirely a top-notch game: not overly original, but very fun, with only minor flaws.