Okay, the ledges in your map are almost completely useless... Furthermore, half of the grass patches can be avoided as well. You can get through this map by just walking through 3 tiles of tall grass. you should force the player to walk through it.
I made a route similar to your's. Try comparing both maps.
You can see that the ledges clearly serve a purpose now, as they allow the player to backtrack without being slowed down by tall grass.