Cool game! Very quick to understand how the mechanic works which is enjoyable, the art is cute and the sound design is very fun :)
Adding "w" in "score" and "combo" is a nice touch too, I love that detail.
As mentionned already by wowa, I thought the game was about splitting cows into two groups instead of ignoring the brown ones (especially because capturing brown cows encloses them exactly as it does for white cows so there's no real way of knowing that before playing). On my second try, after understanding that, I ended up waiting for white cows on top of my screen which was a bit less fun to play than splitting the cows (as it made the game much slower), but at least my score increased! I think I had a score of 230.
Anyway, despite that, the game is really nice. Congratulations!