I know you want to cover up things in fog and distance but believe me, going the extra mile with some detail for the buildings and rides and then cover it up will step up the quality of the overall. Pay attention to silhouettes and negative space. No need to do this early on in a blocking in stage, but you know. Eventually.
Still maintain the original idea of what you don't see is far more disturbing than what you can see.

I love the theme so will follow this with interest. Play some of the Silent Hill if you can find a playstation 1 owner and the follow ups on the ps2. The first Silent Hill may be old and uggly but no game has had me that stitched lol.
Silent Hill 3 is brilliant too. More suspense and very very disturbing. They've studied their Dante's Inferno well and taken loads of inspiration from it.

Have fun with this one.