About word length: the difficulty of finding anagrams increases exponentially (a bit loosely used, but probably correct) with word length. But the game does increase length after a few steps, I just found out. A help page would perhaps be better.
And about adding sound effects: only if they can be turned off easily.
The game doesn't find anagrams though? What I saw was nonwords (random permutations of the letters).
Or if you mean the player's task, that's not finding anagrams either: you just need to choose the nonword that has the same counts of the letters as the word.
And about adding sound effects: only if they can be turned off easily.