One more suggestion that could be improved if we'll be doing this again is that participants should pick some license to their codes and assets. Either the jam could require certain license (this would be the simplest), submission page would ask for license or simply there would be recommendation to do so. I myself didn't participate on day 1 and on later days I wasn't sure if I could slap a license to my modifications - seems hard to keep track of - so I continued the trend.
Now we have a ton of projects that are open source, but it is not clear what we can do with these and with what conditions - can I work on a project outside of the jam and publish it? Even more so if somebody would want to commercialize some project.