Maybe it's just me, but it looks like they're trying to catch and eat the butterfly and this might be anthropomorphizing. After all, small crustaceans of a similar size like Antarctic krill are an important part of their natural diet, so maybe they're instinctively like "oh shit whaddup".
I think a lot of people are imagining this as the penguins being fascinated with the butterfly and chasing it around to get a better look at it kind of like human children chasing one. It's nonetheless, I agree, adorable seeing them hopping around trying to catch it.
Why not both? A game where it is 5v1, one player as a butterfly and the other 5 as penguin. Butterfly needs to survive a given time and has a "height gauge". They can only fly so high for a couple of seconds.
Make it like Dead by Daylight where there is different insects with different abilities and different animals that try to eat them.