The music. Does that count? XD
Sorry, I didn't mean to be so negative, the game's pretty fun too. I love the chaotic nature of having a short track that loops around itself and 6/8 (idr) players on it. Especially since players going one way through the intersection can grab items from and use items on players going the other way. It's so fair (compared to Mario Kart for example) yet so casual.