I find planes on long haul flights very noisy so not sure any game where people have to talk would be very good.
Also it sounds a good way to annoy those sitting nearby who may want to sleep.
I assume it is for kids, so why not buy some cheap pencils and coloring books that can be thrown away at the end of the journey.
Also, most long haul flights have small TVs screens and radio/music channels to listen to in your seat.
The other option is some cheap mp3 players, and maybe put an audio book on their so a whole book can be listened to.