Fair enough, I actually completely missed that rule... Or I read it as "the game must run in 64k" :) (and to make it worse the loading actually loads... nothing! Simply the same level that is already in memory, I was just coding ahead for new worlds for a later version ^^).
If I have just one single feedback for the next jam, that is is to provide more information and tools to create CDT files. I lost the biggest part of the last day trying to get that to work. I didn't imagine a second it would be such a hassle :(
Thanks for organizing the event, I had fun! (and my "level designer" John Random too)