Its purpose is to help you better manage your gaming sessions. It can automatically detect when you run your games, track the gaming time, let you set weekly gaming goals, a gaming session limit and send you visual and audio notification when you are close to your gaming limit. You can also flexibly extend your gaming session up to a degree while you are in game to ensure that you can finish up your current session as you needed.
Currently it only works for Steam games. I would be happy to hear your questions, comments and feedback.