Executable or Installer
Install the game:
Install the apk on your Android device in anyway possible.
example: (Connect your device you a PC. Draw-drop the apk in a folder of your device. use a "Filemanager" to open the ASK and it will probably choose to install it ;) )
Sadly. No such convinient way exists for iOS.
Build from source:
Open the project in Unity3D 3.5.7f6. http://unity3d.com/unity/download/archive
Download NGUI: http://www.tasharen.com/?page_id=140 which has an evaluation version. And place it in the Asset folder.
Select your platform and build it! (the start scene is "mainMenu" if you just want to run it)