Original concept! I like it. The addition of a pretty menu and original music is a nice touch as well (even if the song can get a little reppetetive after a while)
I feel like with a few more mechanics (maybe something like a trampoline to make the sheep jump over obstacles or perhaps even something strategy-oriented like a speaker that can be activated with a button, just throwing some ideas out there) this could be a neat little game!
Awesome job.