Cool concept, and very satisfying to get words right. Though, many times typing a word doesn't work. Also, some letter pairs are more difficult than others (I got x and something else once), this could be fixed by making your own letter pairs and selecting randomly from those, instead of out of every letter (unless you did that already and the x pair is a troll or something). Also wish you could see a list of words you've submitted, for convenience purposes. The concept is nice and thought provoking but it's still rough around the edges.