As it has renders it atleast requires a 1gb of free ram to work the animated scenes perfectly, as for me 4 gb ram is good but 6gb is recommended for now.
(I am not the developer, I just checked the game info and collected the data it was working on)
Even 4-5gb of available space is good for it, the main player here is Ram, you can enable 'Force 4x MSAA' for better rendering power.
Setting -> System Info/Phone Info -> Build Number(Tap 5 times) -> Developer Options -> Under GPU Enhancement -> Force 4x MSAA.
If it is not under GPU Enhancement, kindly check all the available options in Developers options it should be there in any other list.