Comment by Jaxan

This is very similar to “Mosaic” on Simon Tatham’s puzzle webpage. There it is noted that: “This game is variously known in other locations as: ArtMosaico, Count and Darken, Cuenta Y Sombrea, Fill-a-Pix, Fill-In, Komsu Karala, Magipic, Majipiku, Mosaico, Mosaik, Mozaiek, Nampre Puzzle, Nurie-Puzzle, Oekaki-Pix, Voisimage.”

https://www.chiark.greenend.org.uk/~sgtatham/puzzles/js/mosa...