Ross,
I just created a game and was able to complete the process and send it off to you on the PC. Everything seems to have gone fine, so I know that much is working.

Ok, so I got the email stating that it was my turn and was able to play, again on the PC. When I went in to the game list though it showed our "active" game and then another one that looks like you tried to create with other players, one of which was declined. I only got one email regarding the game that is ready to play.
Might I suggest changing or giving the players options for how they are notified? It would be nice to for me personally anyways, to get different notifications and then in the body or the subject saying who I am playing or what game it is etc...
In a different game, GreatBigWarGame, they send out both emails or push notifications, depending on what you specify and they tell you in the notification who your playing. It is a little different there because you can only play player vs. player not like HM where you can have more than two players in a game so not sure how you would work this one out.
-Eric
I'm willing to add Push Notifications and enhanced email support down the road. Let's see how async multiplayer affects our community- hopefully more downloads and people playing to support the game!