I don’t have much space on my device, and République is a large game.
You do not need all episodes on your device at the same time in order to play the whole game. You can juggle the data installed on your device.
In order to play Episode 2, you need Episode 1 installed; to play Episode 3, you need Episodes 1 and 2 installed.
For Episodes 4 and 5, you only need Episode 1 installed as the base application. If you need to shuffle data space, you can install Episodes 1 and 4 to play Episode 4. When you’re ready to play Episode 5, delete 4, and install Episode 5.