There are so many types of Ramen that Japan has to offer. Sapporo Ramen (札幌ラーメン) is definitely one of a kind. If you get a chance to explore more in Hokkaido, you will not regret it (in terms of ramen hunting).
Speaking of Ramen alley, you should definitely go check out Kyoto Ramen Koji whenever you have a chance to be in Kyoto.
Great post!