I missed all of the 2011 season so I don’t have feedback specific to then.
I like the competition format, I don’t think there need to be changes like categories or anything. I think the site could use a minor change, in having the actual game applet hidden by default (for instance the game starts as a screenshot and becomes an applet when clicked) - this is because many of the games use a very CPU-heavy timing loop, and it would be nice to be able to keep a tab open for a specific game without eating your computer.
Originality is a problem, but not one that should be approached in the rules. We should attempt to tackle it as a community, by doing our best to rise above the easy concepts and encouraging others to do the same. I, for one, will always do an original IP with my games. It makes our competition look better, so our games get more players and our community gets more competitors. Or, for a more utilitarian argument - different IPs are better suited to different budgets, platforms, and constraints. No existing IP has been optimized to be put in four kilobytes of java, but your own IP can be.
I’m looking forward to this year’s competition!