I think that anything that is too hard to be submitted to smwcentral should be considered Kaizo. Otherwise, certain hacks will have nowhere to go since they won't be submittable in this thread or on smwcentral. As far as Super Fun World (Snake X) goes, I don't think a judgment can be made based on the first level alone. Kouhai Mario 1 and 2 I would consider to be Kaizo although they are, for the most part, easier than the original Kaizo Mario. This was the first level of Kouhai 2:
http://www.youtube.com/watch?v=M5viHRZg7sM
If you have any doubts as to whether or not the hack is Kaizo look at his level:
http://www.youtube.com/watch?v=Ob1VxFGYdtM
http://www.youtube.com/watch?v=M5viHRZg7sM
If you have any doubts as to whether or not the hack is Kaizo look at his level:
http://www.youtube.com/watch?v=Ob1VxFGYdtM