There is no sound in this game ?

The game seems to be working, but my screen stays pitch black. I can start by selecting "get up" with E on my keyboard. After that it says "use WASD to move". I input E again and the game starts. It seems I can move around and even have sound, but there is absolutely nothing on my screen... I thought this might be intentional so I started moving. But nothing changes, even when I keep walking in different directions for a couple of time. I'm playing on a MacBook. Has anyone else had this problem?...

Anyone know what you need to do for them?