This reminds me a lot of Pikmin! What I really appreciate about this game is how simply it communicates to the player the concept of the game. You didn’t really need a tutorial because the starting screen and the first level helped communicate the idea without the use of any text or arrows.
I would love to see some more obstacles, like walls that the sheep can get stuck on. That would make things a lot harder and you’ll have to figure out how to deal with stragglers.
Great work!