Riven is another brilliant game that shares the structure of using information about the world as both the purpose and the means to exploration.
Outer Wilds excels with creative planets full of adventure, while Riven is a slow paced affair that is impressively dedicated to creating an intricate world wordlessly.
Without written aids ala the logs in Outer Wilds, gleaning insights from disparate information in Riven often means scrawling down notes & looking for patterns.
While I highly reccomend Riven for fans of the structure of Outer Wilds, Riven is now a dated game that operates at a glacial pace. I played it recently at a time that I was taking a break from more modern games and I think that did wonders for helping me adjust to its conventions & pace. If you give it a shot know that it'll demand your patience before it'll absorb you into its world.