I could definitely picture this being a scene in an escape game, only it would be the best escape game art I have every scene! It reminds me of the nether world or a world infected by something or missing something. The staircase seems to dissipate into specks and shadows. The faces on the wall also look like something you'd find in an ancient tribe environment.
However, the background looks somewhat lacking for an ancient environment. It just seems like there is nothing there at all. If there was some indication of mist, a cave, or a sandstorm then it might be different, but the background looks empty and it takes away from the picture. Also, are the five things suspended in midair torches?
Still, I really like the detail you put into this and I look forward to your next post.