It's mostly just a faithful recreation, similar to how the Mario Kart maps are just fun little maps with no real objective. You can kick around the little fruits and props as well as interact with some objects. The center podium in the lobby is a resupply cabinet, and the Chao storage machines are dispensers. There is no objective, but it seems like it would be a great map for a trade server or just when messing around with friends.

Exactly! Just go around, discover various things and maybe see things from a new perspective. If a server runs the map, its great to hang out with some people. Take some screenshots, use the karate dojo, do some rocket jumps through the race track, find secrets, etc.

At first I was like "I've already played SA2, I already know these areas."

But what I like about your maps is I get to explore places that had fix cameras or were not explorable in the game. :)