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I personally use the MIT license for most of my open software, which is pretty normal for a lot of code in the game dev industry. As far as jams go, it is frequently up to the creators or the jam creators. I have hosted game jams in the past and I am usually specific about requirements: 'Use license X if you want to participate in this jam' or 'we don't care if you release the source or not'. 

Creative Commons is great for art (which I don't really distribute as much).

Hi RisingRlyeh! That is some really great feedback. And to be honest, we didn't really think anyone would play this so fast lol We knew level 3 was broken and that the aim was wonkles but wanted to put it up after the game jam. We'll put some more effort into it and give it some love! Thanks for your thoughtful reply, it was very constructive!