How to play: WASD or arrow keys to move, click 0 to select level editor. Cycle through keys: 1 2 3 4 and 9 to select or block or entity. To save, follow these steps: 1. Click O to show the tile list and select export. 2. when you reload, show the list again, right-click it, and select import. Paste the file you saved earlier. To shoot fireballs, click x BYE :)
Credits: @griffpatch did everything for the tutorial. I did basically nothing but follow his tutorial.