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This update (released November 23rd on Steam) isn't available on GOG at the time of writing, but here is the changelog for it:
* Significant perfomance optimization;
* Smaller build size;
* Rebalance of Act 2 difficulty;
* Bug fixes



Here are the full patch notes:

*Gameplay Changes*
Act 2 quest now in line with new Fuel Node requirements
Fixed a bug where more Pirate Putrid Snails than intended were spawning on the "Pirate's Booty" stage on Act 2
Reduced Fuel Cost on Act 2 progression from 8 to 5
Reduced the difficulty on Shooter Challenge and Tank Challenge


*Fixes & Optimizations*
Huge performance improvement
Smaller textures implemented
Fix a bug where Sneaky arm color would be wrong
Fix a bug where the game would freeze
Many broken animations fixed
Bug fixes(Fix cutscene actors quality, Fix sniper white body)
New textures and backgrounds for Cutscenes
New textures for Dialogues
Source: http://steamcommunity.com/games/488960/announcements/detail/268357705185581024

Hopefully we'll get the update soon! I honestly thought the game had been abandoned, and I'm very happy to see that that's not the case.