The creator of this awesome anime 'Attack On Titan' is Hajime Isayama and the game version is developed by Omega Force and published by Koei Tecmo. The entire credits and franchise belongs to these people. Also, this website is not officially created by these original owners but by a group of hardcore attack on titan fans for entertainment purposes.
The Attack On Titan game has been released for Playstation3, Playstation4, PlayStation Vita, Microsoft Windows and Xbox platforms and also, its next sequence is being released. Unfortunately, the game has not been released yet for mobile devices including android and ios. Even though, there are crazy demand of fans waiting for this game to be released on the mobile version, there are no signs of the release yet, so we can just hope for it to be announced soon.