to theme or not to theme

I don't want to discuss whether the final round themes are good or bad (though I have an opinion about that ๐Ÿ˜‰), but would like to hear what you think about completely neglect the theme. If I have a good game idea that I would like to work on in the context of compo, but I cannot fit it into the theme, should I go for it anyway? If I remember right, one can exclude voting categories when submitting your game, so this could be an option then. Is it allowed to neglect the theme completely after all?