I've tried booting up the game a few times now and after the Unity engine logo, the screen is just blank?  I can hear the title screen music so I know something is happening, I just can't see it.  I tried hitting a few buttons on my keyboard to see if I activated a menu that I couldn't see, but it didn't seem to work.  I'm using the windows version, and I've tried both downloads, and I'm facing the same problem.