This was very good and kept me transfixed for the week it took to complete. It's not quite as accomplished as the main game, but still completely worth it for the marked change in tone and the handful of moments that cause a paradigm shift in your brain. Like The Witness, Fez and, more recently, Tunic, Outer Wilds is a magnificent game if you're a fan of frequent epiphanies. After 55 hours of this and the base game combined, however, I need to play something mindless and give my poor head a rest.