We're using Unity (Quarter Circle Games). I'm happy to give an interview and some of my lighting/PP techniques. You can view out game here: https://store.steampowered.com/app/907500/The_Peterson_Case/
This is a fan project, like the Lord Inquisitor was. GW has absolutely nothing to do with it!
The team of GameTextures.com has recently launched the largest library of Physically Based Blender Format materials ever created. The thing is that every single one of their products now contains a proprietary Blender Node file to instantly import materials into your Blender project. Just get it and start creating with Cycles and Eevee.
The update to their products is said to be free and apply retroactively. If you have downloaded any of the team’s products, you now have access to the Blender format version. Follow this tutorial to get started.
The process here is simple: just find the perfect material for your scene, select the download option, and then scroll until you find Blender. For the full tutorial follow this link.
GameTextures.com also has tons of procedural substances on the internet: thousands of drag-and-drop Substances and more. You can learn more here.