you roll a dice, if you roll 1 or 2 you loose power, if you roll 3 or 4 you keep your power, if you roll 5 or 6 you gain power

I'd say that you could understand it that way.

It may also have to do with doing barrel-rolls, or some other kind of special movement. In my experience, game jam themes are not there to restrict you, but to see how far people can stretch them without losing them. Bold interpretations, if get to fit the theme, are best (IMO) than the most obvious ones.

In this case, the theme is quite explicit, tho. But, why not to implement the roll within the game itself, so it accomplishes the three themes at once? I still think there is room to be playful.