I didn't rate it even though I love the concept because it does not seem to work for me!
First try, four-letter word, "pity" was not accepted.

Second try, five-letter word, "tipsy" was not accepted:

Can you please explain what's wrong here?
Also, it would be better if instead of being shown only at the beginning of a game, the category was also shown during the game, so I can remember if I have to write a four-letter or five-letter word!
If you explain, I'd be happy to rate it! Thanks!