Lack of recognition for some words.
It doesn't recognize the word "coquet", for example (though I'm certain there are others it won't accept).
Considering that the game revolves around spelling and vocabulary, this is a major flaw. Hopefully, a rendition with a larger database will be uploaded, as the game's concept and artwork are among the better ones I've seen.
On a side note, I AM allowed to spell words using the "Qu" block, correct?