itch.io

Those are all pre-rendered textures.The only thing that is rendered in real time are the particle effects and the laser effects in the space combat screen.

As a rule of thumb consider most of the stuff in Ren'Py is prerendered. Ren'Py's 3D capabilities are very very limited. It's only good at 2D. You'd need to strap a whole new 3D engine to it for anything decent. That's a task for a game engine architect, maybe even a team. Not that NSFW game developers/artists aren't talented, but scale is way to big, and skillset needed is different