Yeah, Germans are like that... j/k.
A lot of games go overboard with effects to the point of becoming blatantly unrealistic, but sometimes it adds a nice touch (we are trying to escape reality after all). Given your environment, I would say the composition is just about right.
Regarding your demo, I would definitely keep pushing it. Animating the character would be a huge plus. If you have difficulty animating humans, consider animating autonomous robots. Animations always make a demo shine because it's one of the hardest features to pull off well (unless you have a motion tracking studio). It would definitely breathe life into your demo.
BTW, there's nothing wrong with "coder art" I have tons of fun in Blender or using maths to create things. The new tools in Blender 2.5X beta are a dream to work with. There's tons of free stuff out there, but the real deal comes from your own creativity.