The contest requires 3-5 episodes of 30+ panels each.
There is only so much complete story you can cram into that space, trust me xD.
30 panels might seem like a lot but having worked on comics that have 60 panels per episode and seeing how much can happen or lollygag in that space...
Well the more concise, more focused, and more tight your story is, the better.
For my outline I stuck to three characters and a single conflict. No sub plots.
Limitations are good for creativity. It forces you to try to do a lot with fewer things.