If you like works like Infinite Terror, I recommend Screaming Games to you. This book is also based on a game and covers complex human nature such as ruthlessness, cruelty, violence, kindness, tolerance, and universal love. At the same time, it was also a fantasy novel that would give you a different reading experience. I hope you like my recommendation, Mwah ~😗
Typically, manga horror stories often have unique and disturbing art styles. For example, in works by Junji Ito, the detailed and sometimes grotesque drawings enhance the horror. They also tend to play on deep - seated fears like the fear of the unknown, death, and things that are abnormal in nature.
There are indeed apps for manga reading. For example, MangaZone and Crunchyroll Manga provide access to various manga titles. However, the availability might depend on your region and device compatibility.
I'm not sure which work you're referring to. If you can provide more context or information, I will be more than happy to help you answer your questions.