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I don't see problems with the walls, they look good imo :)

No, I don't export parks atm. Partly because I wanted to keep everything as simple as possible, but also because I haven't figured out yet what is the "best" way to encode some data. Parks don't have their own geometry, they are just wards marked as parks, but I don't export ward data so...

Why not export the ward data? Just as polygons with a "type" field that says "building zone" or "park"? That would be INCREDIBLY useful for zooming in, where at distance only the wards are visible and then they fade into individual buildings as you zoom in, the way Google maps does it. And you could export the ward names that way as well.