Absolutely beautiful! The art is fantastic, the tutorial was well executed, and the game tells a story, too.
There were some cool moments where I could jump, shoot and climb at the same time, but to make them more frequent, I think you might have to make the jumps looser, and the bullets more instant. But the game got a lot easier when I realized you could shoot frozen birds!
Overall a complete game with clean transitions, beautiful pixel art and solidified mechanics!