Death Moon has one of the most beautifully executed themes ever in a Geometry Dash level. The song, the gameplay, the art with all the symbols, create a truly immersive and thematic experience. While other levels were still experimenting with effects, this level just nails all of them down into a complete package which just puts into perspective how awesome this level really is visually. The gameplay also compliments the theme very well, like with the iconic drop effect going in tandem with the "snap" on the song. Every part has this beautiful unity of gameplay and theming. The ending is also one of the best in the game. Definitely one of the contenders for the best overall GD level.