I've looked it up and I guess you mean this one:
Well there doesn't seem to be any real depth, so you could handle it as being top down.
Depending on what you'd like multiple movement behaviours could be suitable, but the easiest one would probably be pathfinding.
Cover the areas on which you can't walk with solids and set destination to the mouseclick.
On certain objects clicked you could add a precise point to walk to.
Actually, if there was scaling involved it wouldn't be that hard either..