Any way to get around that? I want to play the game in a 4:3 aspect ratio, so I pick the highest 4:3 resolution that fits on my display (1920x1440), but no matter what, it keeps stretching to 16:9. Any way to force 4:3?

EDIT:
Seems it's actually hardcoded that way from GOG. Even if I change my Windows resolution to 1920x1440, the game is still in widescreen even when I launch it in 1920x1440. It just has black bars on top and bottom. Guess I'll have to suffer through it and play with everything stretched from the original aspect :/

EDIT 2:
Managed to get a proper 4:3 ratio through this thread using dgVoodoo
https://www.gog.com/forum/soulbringer/new_patch_for_better_compatibility_with_modern_systems

The issue is, that the main menu is becomes completely uninteractable with that patch, but the ALT-TAB trick luckily works for that too.