GrafX2

GrafX2 is a bitmap paint program inspired by the Amiga programs Deluxe Paint and Brilliance. Specialized in 256-color drawing, it includes a very large number of tools and effects that make it particularly suitable for pixel art, game graphics, and generally any detailed graphics painted with a mouse.

Most buttons have alternate function if you touch the button and tap the screen with a second finger.

Sources: https://github.com/pelya/commandergenius/tree/sdl_android/project/jni/application/grafx2