I'm currently in the process of playing the game and wow, it's pretty massive. You have a tough job, KyoAni, to summarize the whole game into 13 episodes and you still managed to deliver. Kudos to you! Though you would have done better if episode 13 wasn't a stupid recap... I still can't forgive you for that.
The thought of a more faithful adaptation done in 24 episodes still haunts me to this very day.
AIR feels more poignant to me personally compared to the new Kanon so I would love to see that.