This is a really cute idea. I had fun playing with it.
I wish the vine had been a bit stronger. There were places where it seemed like I could get up underneath platforms to catch upside down cows but even by swinging I wasn't able to get a hold on the underside. I think it would have been pretty fun to climb around on the ceiling. Maybe I just didn't get the swing right.
It was never clear to me what the expression changing mechanic did, or if it did anything at all.
It would have been nice to have a linux build. It ran under wine but without text because of a missing font.
I feel that the art style was crude enough to actually detract from the game. This is a neat concept and reasonably well polished as a game but it looks very amateurish.