I run a Mobile Free to Play Game Design Consultancy www.mobilefreetoplay.com - we've helped 50 studios from EA, Warner Bros, AdultSwim, King and multiple hyper casual studios. We help out with GDD's, Game Feel, Monetization, Retention and Long Term value.
I've helped to launch over 100 successful gaming apps to the app store. I'd love to advise you on your gaming project and the key factors in helping to create success.
Cut the Rope
Anomaly Warzone Earth (Apple Design Award Winner 2012)
Contre Jour (iPad game of the Year Europe 2012)