Various games not working on Steam for Mac
I'm not extremely well-versed in technological terms; I just like to play games. I buy the games, I download the games, I play the games. What I can't understand is why I bought Shelter and The Stanley Parable and they don't work. When opened, no windows appear and an icon shows up next to the Steam icon at the bottom of the screen, then it just dissapears. Sometimes Steam closes too and it's only upon opening those two games. Is there any explanation for this and/or anything I can do to make these games functional? Thanks ahead of time.