I promised hints if there would be no correct guesses, but we got four in the meantime.
But my post #61 is still valid.

8: Knights of the Old Republic 2
25: The Sims 2

Well, a double guess, for the game this time:

27. Frontier: First Encounters
33. Frontier: First Encounters

1. Alien Shooter
8. Advent Rising

^ nope to all above (bar Sims).

Are you randomly listing GOG games that could somehow fit the theme? :D

Not at random, no. I picked a couple of the images, then started looking down GOG's gamelist for games that might fit the image.

Well, good luck then ^^

27. Gorky 17
11. Fantasy Wars

27: Space Firebird

Really? ;)

The boxart pics I found looked a lot more impressive!

As you can probably tell, I've hit the "bottom of the barrel" stage!!

11. Uru: Ages Beyond Myst.

I was pretty surprised that 39: Space Quest III was wrong, so I went back to the game. And you're right, it's not the one... but it's *very* close, check out these screenshots. Even the pink nebula is there. Hmmm....