I can't figure out what a lot of things in this scene are. They look good visually, but I can't figure out what they are. The green square on the top-right, the pink/green/blue blocks which look like they have little teeth/open mouths on them. Also I think the transition color between the land and water(?) could use some work.
The green square is the goal where you need to lead all the sheep. Its supposed to just be a different color of grass, so I probably don't need the bright outline...
The pink/green/blue squares are buttons that open the gates of the same color. The symbols are sheep heads (they represent the number of animals that need to stand on them to activate them). I'm not sure how to make that more clear at such a low resolution.
I might try something different with the water.