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An update snuck its way onto GOG that, seemingly, addresses some of the issues I had with the game such as lack of graphical tweak options. Downloading now.

In the meantime, to whom it may concern, here's the changelog:
Update 12 (9 November 2016)

Performance improvements
Resolution no longer resets after loading
Added more details graphics settings
Fixed skybox on resolutions other than 16:9
Small gameplay tweaks
Improved encounters with enemies
Language fixes
Mouse cursor no longer shows up during the game
Post edited November 09, 2016 by -cerberus-