The absolute dissonance between the gameplay looking like something out of ULTRAKILL and the setting consisting of penguins running around squawking made me laugh so hard that I had to stop playing for a good 20 seconds or so. Nice going with the art!
I do think the game could use some instructions. Even something as simple as a "how to play" on the main menu would have been helpful. I did eventually learn how to play the game through trial and error (holding down the snowball button charges shots, penguins can unfreeze if left unfrozen long enough, etc), or at least well enough to win the game.
I have to ask though: how does the penguin AI work? At first, I tried chasing down the penguins, but it seemed like they would always strafe me if I got close enough. I eventually won by sniping them from long distances, which seemed to do the trick.