What an adorable game! Gotta be honest i wasnt really feeling for the music, but the more i played, the more it grew on meI Also nice detail for having the penguins move based on the arrow keys i pressed. i especially love how the number of penguin audience is directly tied to how well you perform. I also appreciated how, instead of just making the notes fall faster at higher difficulties, the song itself speeds up and changes tempo, each song on each difficulty has a fresh vibe. Gentoo on Fast was a blast to listen to!
That said, just needs a little more polish in the art and visual effects department. Maybe have a vfx that shows which notes you missed or hit perfectly. Also having the background match with the penguin vibe would be super cool, maybe have them play inside an igloo, maybe adding polar bear bouncers chilling on the side of the stage.
Overall, i totally vibe with this game! Really impressive for composing three diffferent songs in just ten days, especially when its your first game jam entry. Well done!