Even with only 5 hours played, its easily Outer Wilds. I'd go so far as saying it's in my top 5 games of the past decade. I had not even heard of it prior to release, and downloaded it because the icon was cool.
Imagine my shock at how incredible the game was. I stopped playing and looked it up online that day, and yeah I missed out on info on it pre release lol.
Outer Wilds coming on release day to GP is a further testament to how amazing the service is. Far and away the best thing to happen in gaming in the last long while.
If you want to go on a real adventure, piloting your spaceship through a solar system, uncovering the bizarre mystery of what exactly is going on, while stuck in a weird Groundhog Day situation , play this game! For the sheer raw sense of being a space pioneer and the incredible gameplay of flying with physics, piecing clues together, and pushing ever closer to the truth in a 22 minute cycle increment, Outer Wilds is a revaluation and made me feel like a kid again while playing.