I stopped watching Game of Thrones around the start of season three, because there were too many people and I couldn’t remember who most of them were or why anything they did might be significant (broad exceptions: the dragon lady; the incest twins and their sandwich son; Jon Sner). I don’t really think Game of Thrones translates well to being a game of games, for similar reasons, but Reigns: Game of Thrones is good, because it’s a Reigns game with Game of Thrones elements, and not the other way around.
Reigns: GoT sidesteps having to deal with canon and non-canon consequences by using the fire visions of Melisandre be a framing device for “what if this person was the ruler?” This unlocks off-piste possibilities and gives you the pick of seven favourite characters and one dude I don’t remember at all. The ultimate goal is to survive the winter. My ultimate goal is figuring out who everyone is based only on the context this game provides.