I loved the opening cutscene! All the sprites were really cute.
It took me 35 game overs but I eventually beat it!
I think the frog handles the best given the precision needed to hit enemies (collisions are really tough and unforgiving, any side pixels touching spikes or enemies seems to be death even if you're mostly on top of the enemy or next to the spike) but I enjoyed playing as the cat the most!
Pig felt a little neglected in the later levels, and I also felt like I could've used checkpoints at the flags on the last couple, maybe. They were hard for me!
I love the overall creativity of having to juggle the characters and the simple sweetness of the story. :)