23 Moves (revised)
80 Water drops
Normally when we have things like fireflies, we always suggest removing them as your first priority. This time, don't bother.
Your first priority needs to be to get the sheep moved over to the grass at least, if not the hay.
The best place to move your sheep across, is to get them to stand in one of the slime squares, that gives you a clear shot to the hay if your crops line up correctly.
Save your shovels if you can, then if you have no sheep left but are getting low on moves, then you can drop crops, or remove crops with higher points on, using them.
Its highly frustrating getting to the end and just needing one more move and have used your shovels earlier.
The grass is where the points are, so don't bother trying to make them on the left.