I liked the music, and it was pleasurable trying to play along with the songs.
I'm not sure about the gameplay apart from the music part, but those were some proper nice tunes! (Tho maybe they weren't very game boy-esque...?)
I kept feeding the kitty but it din't grow :( it seemed happy tho, which was nice
(Bonus points connecting A and B buttons not to the letters Z and X, but to their positions on the keyboard. As an alternative layout user I feel seen :)