Reminds me of the oldays Freescape games (3D Construction kit). I liked the very abstract cool atmosphere which is also in your game. I wouldn't make a shooter out of this scenary (just my personal opinion) but make a puzzle game or some kind of spindizzy worlds game. Or a scifi story with text or spoken .wav text files. Anyway, abstract games with plain single color texturing can be found quite a few on the net (indie games especially), there is nothing wrong with it. So its a good start, spin it on, there WILL be people who love it.

Thanks for showing us your work !

NeoDumont