Spanish comic artist Abel Alves has released a free-to-download 8-bit platformer for Game of Thrones! You can find it here. It's complete with adorable character design and 8-bit covers of the show's theme song and "Rains of Castamere."
I believe you can play as Jon, Arya, Tyrion, and Daenerys, though I've only just started. If you download, make sure to look at the ReadMe for the controls.
(ETA: Just a warning, there are some annoying pop-ups during the download process.)