I'm running Gearend on a Windows 64-bit PC with a AMD FX 6300 and a GTX 750, and I noticed that after opening the map, the game halves it's framerate until I either die, or I leave an area entirely.
It's pretty much making the game unplayable, as it's impossible to really move anywhere with speed or precision after you open the map.
Other than that and the god ray shader appearing super weird, everything else works fine.
Can't wait to play more of the game! :)