Similar experience here.
I launch the Gog Galaxy thing, It shows a still picture with 3 bikers and 3 names that I guess are logos, plays a few notes of music and then the everything disappears.
I am new to Gog, never played anything from them so far, and it's not a great first impression.
I would love to see at least an error message to know what is the problem.
What is your system? Are you windows 8, windows 10? Linux? Mac? Have you tried contacting support yet? I found that this game can be real sensitive to virus programs. I had to pause my Kapersky to get it to work.