I loved the art direction - I think you got the level of minimalist detail in the environments just right, and the fog effect/outline shaders were really nice. My game locked up for a bit when i got to the switch and the environments started showing their non-orange selves which I wasn't sure if was intentional at the time since it seemed to go against the art direction otherwise. But nice job anyway - I think the art coupled with the synth music created a great sense of atmosphere.
Small bug: playing windowed on a two-monitor setup, the mouse sensitivity was far too low and I found myself having to swipe multiple times to move the camera where I wanted to look.
My only real suggestion for improvement - I think the level design could be restructured to be a little more guided. I understand wanting to create a more open-feeling world but at the start I got lost while looking around before I finally made it to the casino. Reducing the number of alleyways or having more lights/points of interest guiding you in the right direction might help, though I don't have the greatest experience with 3D level design so take my words with a grain of salt. Great job anyway :)