I think it needs some claustrophobia - there isn't a great deal of 'furniture', I think that you need more, but also I think it would make it more tense if you have to go through dark corridors etc, rather than big open rooms. Don't think for a second that you can't re-use stuff, I mean flip it around, change textures, scale - if you don't have a lot of geometry to furnish your game, then your gonna have to re-use it as much as you can bare. Like, there's a room with a pipe valve thing at the far end of a large and mostly empty room - I'd change that to a row of 4 pipe valves at each side, fill the room with them, because that's more like an industrial environment... really it's rare to see just 1 or 2 things - if a complex needs 1 or 2 pipe valve things, it probably needs 8. If you make a barrel to stick in a room, stick another 10 in there to be on the safe side. Our world consists of totally un-unique shapes that are repeated over and over and over - in my office at work I have 2 identical cupboards, 4 identical filing cabinets, 2 identical PC's with identical screens and keyboards. I think you should make a shedload of industrial pipes and fittings and sci-fi bits, and re-use them all over the place. It's not about making the game fuller to appease GOG admins, the game is crying out for more detail I think and with that the lighting and mood will be so much more effective.