The game is way too dark and there's no way to change it from the games options menu.
There's an upgrade patch to ver 1.1 which should increase the gamma, however I don't know if it's already applied. I've tried applying it but it doesn't detect the GOG version.
The only workaround I managed to come up with is to run the game in a window and manually adjusting the gamma from the NVidia control panel, but playing in a window SUX
Anyone?