Sorry for the long wait - it sucks to be away from a computer for days.
Objective:
Design a level that best represents the action in a *specific* video game. The more the simulation looks like actual gameplay, the better.
I would recommend a side-scroller like sonic, but you can do anything you want (i.e. Halo, Portal, etc.).
One more thing, Armadillo should be used a lot.That doesn't mean you can't surround Armadillo with a vehicle or put him in a person, it just means armadillo should play a main character role in the level, not just sit in a corner and cry.