Ludum Dare has an Overall category for this very situation. Can you let people vote for overall the next time around? I'm not familiar with how hosting jams works on this site. Median seems most fair to me for the current situation. Though, I just find this a "just for fun thing" so I don't care too much either way. Saying as the creator of GLET
I'd rather a game that bends the theme a bit and is interesting/unique/fun, than one that takes it more literally but isn't fun.
Thanks for putting this on!!!