How did you do this?!
By rapidly flickering the sprites placement every frame and using the double wide script. I'm able to make 1 sprite look like 2 exist. And on a real CRT or a good emulator the flickering sprites look solid. Add that with some careful color placement and you can make some detailed walls using nothing more than 128 bytes of RAM and have some leftover data for other operations and updates. And I'll soon have a screenshot of the battle screen showcasing even more of my sprite flickering tricks.