I admit minimal experience with survival and builder games, but for me neither subgenre has yet surpassed Subnautica. In its own quiet way, it's a game about the passage of time and how time changes in relation to the space you inhabit - refer to the game's final post-credits line and how it contrasts to the unforced rhythmic flow of life on the alien planet, defined solely by your basic biological needs and the day-night cycle. Aggressively and intrusively buggy but a lovely, thoughtful experience.