It seems enjoyable, however there is a bug present that does not allow you to press jump while you are holding the walk button. I'm still a bit new to C# and programming with Unity, but I believe you should just need to add a script that will allow for multi-touch functionality.
I hope you update in the future as I love platformers and would love to play more.
Edit: There is also an issue I ran into during the early stages of my platformer. When your character collides with the side of a platform he stays there, as if it were sticky. Watch this, starting at the 14.40 mark. This will help you fix that.