I've noticed, that the game does not start if the frame counter is enabled in Steam. I only get a black screen with the gauntlet courser. The frame counter itself works, since I can enable it via the Steam overlay, once I am in the game, but I have to disable it again in order to start the game.
OS X 10.10.2
MacBook Pro 9.1 (15-inch, Mid 2012), Intel Core i7 2,3GHz, 8GB Ram, NVIDIA GeForce GT 650M
Game version 1.03
Steam Build Apr 2 2015, API: v017, Package version 1428012781