Echoes of the Eye is an incredible DLC for my favorite game of all time. It's mystery is more challenging to solve than the base game's, but is in my opinion, more rewarding. The light that it sheds on the base game's story and the areas it improves upon, make it a perfect experience for me, just like the original. With just as many exciting, beautiful, terrifying, and revelatory moments as Outer Wilds, Echoes of the Eye is a must play, just as much as the rest of the game.