Overall, it can be said that Attack on Titan: Roar of Freedom borrows gameplay of the well-known tower-defense Clash of Clans and blends it with the unique art style from Japan.
Source: mmoculture
Attack on Titan: Roar of Freedom launching in Japan soon
A brand-new mobile game based on the popular manga and anime series, Attack on Titan, titled Roar of Freedom, will launch in Japan this March. The game is developed by DeNA and will be available on the Mobage platform. Familiar characters will be in the game as well.
The gameplay of Attack on Titan: Roar of Freedom is for players to build up their cities and defend against the rampaging Titans sent by other players. There will be resources to gather, structures to both build and upgrade, and Titan units to produce as well.