I believe The Beatles: Rock Band came the closest to being perfect. Eveything about that game was just beautifully done and the only things missing was Pro Drums, an option for Keys, and a few more Beatle songs (Hey Jude, Strawberry Fields Forever, Yesterday etc. etc.)
My vote is for Slay the Spire. Invented the deck-building roguelike genre and did so with an interesting setting, simple but appealing artstyle, memorable soundtrack, and very tight balancing across 21 difficulty levels.
Also Tetris, but that’s already been said.