If you see ANY renpy games and want to extract their game data, here how you can do.
1. Go to this Youtube video for tutorial how to do it.
2. Download the RPA extractor software, link on the video's description.
3. The video quite explanatory, please watch it for 5 minutes, and you can extract all future and past Renpy images.
It's worth your time to learn it.
Edit : For some who can't download RPAExtractor software from the video link, I'm include it in here. For admin, if the link cause trouble in the future, cause I don't know the legality of share this file, please do so remove it.