This is the rough sketch of the cathedral that I drew and the pixel art that Mr. Saito completed. This complex composition, which is easy to draw by hand but difficult to convert into pixels, was beautifully completed.
This sketch was drawn by game director Tez Okano, for the game Astro Boy: Omega Factor, a GBA title.
Pixel artist Tomoharu Saito then completed the image for the game. The tweet in the source has a second picture of what it looks like. It's just part of it, but during gameplay, you can scroll the background further up for more details. You can see the finished asset in action here!