hello! i made this level editor by myself! it was actually pretty easy to make. also if you place the start block or end block down and it doesn't get placed down, then that's intended so the player doesn't get stuck in the start block or end block so you can beat the level.
this is for the editor: left and right arrows to change blocks, and a and d for rotating the block. and e to delete blocks you have placed. also press 9 to get the save code