Use the arrow keys or WASD keys to move. Use the 0 key to toggle between editor and play modes. Use the arrow keys and WASD keys while the mouse is on the editor palette to move tiles. Use the space key to auto-build like this: First, click on the top left corner tile in the level editor. Then, hover over the place you want to spawn the tile in the level. Hold space and drag. While in the editor, press the 1, 2, and 3 keys to change which layer you are placing a tile. If onion mode is not enabled (press a 1, 2, or 3 key twice), you can open the pin palette, hover over a pin, press 1 to place a pin, and hover and press the X key to remove a pin.
Tileset: O_LOBSTER Avatar: Vryell Thanks to @griffpatch for the tutorial!