The game starts paused, so you probably just need to click the play button on the bottom left
Okay, looks like it's some weird bug
Please try sending me your log file:
1. Open Finder
2. Click Go -> Go To Folder (or Shift + Command + G) and enter ~/Library/Logs/Unity/
3. There should be a file Player.log, please send it to me at sadambober@gmail.com