looks basic. generic textures, lightning, no special effects, emty rooms. very WIP thats for sure. but a good start. fill the rooms with anything. i reccomend dirt, it all looks so clean. stuf that lies around, more stuff onscreen...

also a FPS Shooter is an oxymoron because FPS means first person shooter, so you basically have a first person shooter shooter. are you shooting first person shooters in this game? (wait... that ives me an idea!)

other than that, good start...