WASD to move 0 to toggle edit mode 1 and 2 to change tiles. Found this in the archives. Thought people might find it interesting. Don't know if anyone wants me to update it. https://turbowarp.org/1250292186?size=320x290&stuck&offscreen&interpolate - Turbowarp for those who want the actual Game Boy Aspect ratio without the white border.
Sprites were cut out by yours truly- it was a pain, and Pallet Town was drawn in the level editor (each tile was cut out by hand). The reason you can't go very far is that there's nothing more- I could theoretically make it huge and just paint Kanto, but would I really do that (I totally would)