Interesting. I’m a bad shepherd but shall speed up? :D
I think, the interface did not always reacted in time to user input. You might have a performance penalty somewhere.
I picked one sheep after the other and was done in like five minutes. So there’s enough time to play some background music.
The trees were sometimes too close to each to estimate where sheep would get stuck or not.
All in all, doable game that requires some planning.