I believe, in general, play is good for humans. I think our society kind of makes us feel like playing games is for kids. But, I think we learn and keep our minds healthy through play. I think that's why video games are so popular even with adults. Playing pretend, solving puzzles, acheiving small goals, etc are all healthy for our brains.

So, let your son try it if he wants. Maybe it would be a good game for his friend who has trouble on the phone, since it's auditory processing.