Would you consider adding these features:
1. ability to set the focus for entering letters out of order. This would improve playability as you could construct in-progress words with blanks in them.
2. Only allowing entry of valid words for 6-8 letter games
3. For 7&8 letter word games, provide two 'hint' like options. A one-time checkbox allowing entry of a 'combo-word' combination of two valid words ( e.g. DOGHELP) and a check box to allow jumbled letters, one time (e.g. WYBFGHU).
You may want to credit them with a less 'win' if a help option is used.