I linked my iOS account to Game Center can I now play on all my iOS devices?

No.

Linking your guest account to Game Center is only used for achievement purposes.
Your game will not be saved on our servers and you will not be able to play it on another device.

The only way to make your game playable across all your devices is to register an account with one of the supported platforms.
https://gota.zendesk.com/entries/39194004-I-play-Game-of-Thrones-Ascent-on-a-mobile-device-how-do-I-register-an-account-

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