Every platformer needs a simple enemy like a Goomba to just get in the way without really being a challenge, so here's our first bad guy. They wanted to use one of the hedgehog ideas and refine it a little.
Although it does seem like a waste to toss in easy enemies for no reason. I guess they're for the player to get a feel for how the game works in the early levels. As far as I know it doesn't have any attacks, it just rolls around and can be defeated by being stepped on. Later this week we'll get a look at some more threatening things.