0 to toggle editor mode 1 2 3 4 and 9 to select a tile. e to change the tile to the one you are hovering on. press o to load a level.
Thanks to @pommukutti for providing a good basic tile scrolling project from @griffpatch 's tutorial. Remixed project: https://scratch.mit.edu/projects/503930582 I started experimenting with this after I had accomplished porting the GOISE player to Appel. One of the things that bothered me was that I couldn't get the editor to work in that project. But here, I managed to get it working. Who knows what this could be used for.