I think there's an interesting game here, but I found it hard to determine if I was getting close to a puzzle solution (or even what the goal of each level was?). I think a little bit of text explanation for new elements would have gone a long way. I initially thought I had to get all pigs in the pen, but I won a level or two by just shooting a single pig through the pen. Not sure if that was a bug or an intended solution but it left me a little confused as to what I was doing besides randomly shooting the pigs toward the goal and hoping something would work out.
The pigs and physics were very cute, regardless!