I just downloaded Cytus and Deemo but both dont work
Contact the makers of the two games by email and ask them for help on why it doesn't work for your phone.
It does work but it just stays on the white screen after the game says: "For best experience use headphone" or something like that
Email them and see if they know about the problem and ask them when they plan on patching it. Are you using any custom rom or have you modified your phone in any way?
No I just got this