The way the sandbox is done there I don't have an issue with it. I've seen some sandbox where you have to click 8 times just to get where you want to go. That is way way to much, and I lose interest fast. You don't get lost with exploration either. Now given how the Lobby is setup, I do worry that it could get too convoluted as it isn't like we can spin 360 degrees to get our barrings. (and I am talking a slow look around, head turning. the image of North then an image of South doesn't cut it as our brains do not work like that.)I love the sandboxy elements too.
This is where I like how some VNs actually put "room buttons" on the page to state where you can go. But it would look really awkward for such to be created just for the Lobby though. So I really don't have a good compromise idea to suggest any form of a change.