Steam now offers an OS X edition of Hotline Miami along with the Windows version of the throwback action game. Here's a refresher on the game:

Developed by Dennaton Games and published by Devolver Digital, Hotline Miami is a high-octane action game overflowing with raw brutality, hard-boiled gunplay and skull crushing close combat. Set in an alternative 1989 Miami, you will assume the role of a mysterious antihero on a murderous rampage against the shady underworld at the behest of voices on your answering machine. Soon you'll find yourself struggling to get a grip of what is going on and why you are prone to these acts of violence.