Set it more in "Doom'land" and it might be understood. Or at least have siome vague elements of what Doom is to people. Like a small bar of life and other statistics below the picture, which you could then put some small hints into the life bars and such about the meaning of your sub. Interesting concept, but keep working on it.
About my design
I always loved the look and especially the sound those doors made in the games.
Hopefully some people on here know what I'm talking about. :)