Tip: When determining a time limit, remember that players won't be as familiar with the level as you are. If you normally complete the level with around 100s left on the timer, others might run out of time on their first try.
Written is preferred but I will allow points to be given for videos. Video would be judged on substance and relevance to the hack's qualities just as written reviews are. A generic playthrough (e.g. speedrun, longplay, Let's Play) does not count as a review.
Just look above you... If it's something that can be stopped, then just try to stop it!
I don't see why creativity should matter; the hack creator is looking for substance, not decoration. Either way, it's better to stick with text since looking through text is easier than searching through a video.