Enter "N" at the start if you don't want a blank world. WASD to fly around. Click on a tile to destroy it, click on air to place the tile, mouse scroll wheel to change the tile you are placing, and "E" key to select the tile you are hovering over. Feel free to remix the project and edit the costumes and make them look better. If you do, I may add yours to the original. (I don't really care for my artwork)
All art and code by me.