I really like this app, it pleasing on the eyes it's well-designed, has a lot of social features but remains simple so you can focus on your goals not running the app. I would suggest to add an ability for "gold" that is currency only valuable to you so that your personal rewards, aka don't work against playing with your avatar and currency of that kind should be able to be exchanged within party. That way you and your friends can gift each other screen time or whatever.