It was developed using Ren'Py and I am interested in this tool also.
I have developed a fan made game 'Novena Diabolos - The New Baptist' under the approval of original developers.
The original game 'Novena Diabolos' is an occult mystery adventure, but I built my fan made game as a visual novel.
Credits.
All the texts are in Korean. But, if you want to play, please follow this link;
ZIP for Windows: https://drive.google.com/file/d/1keKanJ ... sp=sharing
APK for Android: https://drive.google.com/file/d/1eZH2bX ... sp=sharing