Thanks for playing and reply. Your advices are very promising.
I would definitely try the first 2 ideas you mentioned. The original concept was revealing more information with each countdown, now I think the attempt of the player, both success/fail both can act as reveal.
Open source text sounds cool combined with leaderboard that player can play in an infinite loop.
Player uploading their own text is really interesting, I did not think of that earlier, it got many potentials.