Add an arcade, Igloo Club (could make club penguin references), more traveling of course, and probably add the ability to interact more with Pingy himself (Kinda like an RPG type chat where you can build your relationship with him), and last but not least you should add multiplayer visiting if it's not too much to ask (I'm sure it is though).
 "Learn to Fly 3"){kind=icon}
 "Pingy the Ping Idle RPG"){kind=icon}
 "Burrito Bison Revenge"){kind=icon}
 "Bloons TD 5"){kind=icon}