Consider the following:
Turn Based Games Game Entry Button Color Indicators:
On ACTIVE GAMES menu for turn based games - have two different colorations for game entry buttons. Green coloration of game button indicating your “submit” button has been pushed, ie. you do not need any action. Blue coloration of game button indicating “submit” button not utilized (options for game moves exist). This would just be an alternative or supplement to email notification, where you can go to your games page and enter into only those games requiring updates.
True Alliance Game Variation:
Additional game types to the current “one player to rule them all” victory parameter. Consider true alliance game variety, where can have fixed unbreakable alliance option with maximum of either 1 or 2 additional players, where when victory is achieved both players either get full-win or get partial-win credit. The victory condition requirements can either be shared among allied players OR need be met by a single player on the team.
Weekday Update Turn Based Games:
Have option for weekday only games, where during week games update either by all players utilizing submit game button OR by maximal time interval passing causing auto update.
However on weekends, game will only advance if ALL players utilize “submit” button. Otherwise game suspends for weekend.