Oh my god the little squeak when the penguin jumps is so cute I CANNOT STAND IT
huff.. huff...
Okay, now that I have that out of the way, I can talk like a sane person :D
This is great! The art is polished and reads extremely well, with a nice tileset and a good palette. The animation on the penguin is very, very good. The level design is also excellent, with a smooth ramp up into the difficulty of the later levels. When things got frustrating, the cute squeak of the penguin kept me going!
Excellent job!