I really like this game! I love how polished it is and personally had no issues with bugs and stuff. The art was charming and the game mechanics were fun.
My only criticism though is that maybe change the collision of the frozen penguins to move towards the players direction, not just being locked to the 4 cardinal directions (i.e. allow pushing frozen penguins diagonally and such). I had some situations where it was a bit frustrating to push the penguins with my character so I had to waste some bullets to push them in better ways (though maybe that's intentional?). Overall though, great game!!