You'd have to give the characters magic and summons as per FF traditions, which even on the island it wouldn't make much sense, ie to have Bahamut coming down from the sky or have someone casting a spell? Nope. Not sure if a RPG would even work to be honest, maybe an action-adventure game like Uncharted.

Glad the show's over though, they could've done A LOT more throughout this season and in the finale, but overall I'm satisfied.