Thanks for all the positive comments guys.
The game was all entirely designed and made by myself with countless hours of trial and error.
I love the idea of the virtual keys visually changing and will defiantly keep that in mind for a future update.
Relating to Game Center achievements and leaderboards, is there a way to direct the player to Game Center. What I mean by that is having a button which when pressed opens either a web browser or the Game Center app so that the achievements or leaderboards for the game could be seen. It would save making a new room within the game. A lot of IOS games (such as Angry Birds or BOZ) have this functionality