Isn't it possible to use subtler values? Something less opaque? That'd look more like a haze and less like the level has been flooded with heavily-concentrated yperite?
I like the color of the fog, but not how thick it is. I can't figure out how to make it less thick. Bringing the fog color up towards 0x000000 makes it look way too dark, but bringing the fog color towards 0xFFFFFF makes it look like there is slightly orangish fog everywhere. Is there actually a way to make the fog less 'thick'?
Without fog, we get it looking more like this on the other end of the spectrum:
Also, the level needs enemies still. I haven't figured out which enemies would work best yet, so that's why it feels so empty - it is empty.