Really nicely done (need to set the Character spacing
How about having some sort of power ups triggered by double tapping ? The problem with this sort of game is because you limit controls you can limit variety as well.
Thanks paulscottrobson , I will probably do something with the double jump, but your right saying the controls are a bit limited with mobile, you have to think outside the box a bit, without making it too complicated for mobile, but also complex / interesting enough to keep the user engaged.
cheers