What I meant was the artistic styling of these films rather than the technology had formed at that time, although that was a part of the limitation that forced these film makers and their actors to use expression and exaggeration (this applies to both actors and stage "architecture") of it to express what was going on within the film instead of having a load of text slides that write out what is going on, on screen.
I haven't really had much interest in German expressionist painting, but I can see what you mean. I could really see a game set in the world of a Kirchner painting. It would be great to see.
I would, if I may, like to show everyone a few stills from Fritz Lang's Metropolis film, just to soak in and maybe understand what I mean:
The idea behind Fritz Lang's film is that there are hugely rich people who are largely oblivious to the suffering and hard working of the lower classes that keep their city running.
I am trying to find some stills from Der Golem (1920) to show off the village and its twisted village architecture, but it's harder than I thought... But if you are interested it is available under public domain over at the Internet Archive