Let me explain.
People agree that it is most similar to VII and X.
I see some VIII things also.
Concerning battle system it has something similar to the sphere grid.
It has the futurism of FFVII and VIII and some drama like in IX.
There are also two worlds like in IX and the concept of massive people dying to bring salvation.
It has an anticlimatic easy last boss like on X.It also shares with X the concept of being deceived by the government.
And the concept of making a sacrifice to the gods to bring peace to people.
Other persons can tell you more.
I think you will like it though.