As for not hearing voices, I will assume, you have heard zero general sound effects as well? I.e door opening, windchimes, footsteps, glass breaking etc. Your SFX sounds may be set to 0% so you don't hear them :) go to your sound options in the Settings menu, and set the volume of the SFX higher so you can hear them. Let me know if this was the issue!
As for no blinking ... that unfortunately, I do not know the cause of. I will have to see if this is something all Mac users experience, or only you to determine whether it's a bug in the game itself, or your Mac is not running it properly.