Now this is an excellent learning game for those who've gotten a bit into english already! Others consider me quite skilled in the english language for a non-english person, yet even I made a few mistakes here and there. Turns out that even someone of my apparent skill can get further using a game like this. And the story behind the game isn't too bad either.
It seems that you have a great skill for both creating a good game, AND for teaching! I give all my fivers to this. It deserves it!