Great game, I just discovered it and I've already completed the classic levels! I wanted to continue the experience with some modifications to the game, and while I can modify the wall sprites, for example, I can't modify the enemies...
I just tried to color their faces black, keeping the image characteristics (as I did for the wall files), but it's impossible. The sprites that are displayed are still the original ones, even though they are no longer present in my assets and have been replaced by my own.
Am I missing a step? I don't have access to the itch files because I bought the game on the Playdate store. Maybe the answer is in the zip file, I don't know...