Latest GOG version is 2.2 while latest Steam one is 2.3.4 that, while most of the changes are related to Steamdeck, they also include new languages, updates to existing languages and a fix for non-english PC users.

@Ghildrean reported what is missing, but even if it is a steamdeck update it should be here because it can run games from GOG. For example YS IX received the steamdeck update here.

Astral Ascent just released on Nov 14th with 1.0 and is missing a build for Linux even when one is available on Steam. It's unclear if one is in the works so for now it should join the list.

Star Wars Empire At War:

The games got patches to increase compatibility with the Steam Deck, and apparently also a 64 Bit upgrade lately.

On GOG we are still on Vanilla.

Dark Deity: Complete edition seems to be missing the latest update v1.58 that fixes crashes when playing in a different language other than English. Don't know what is the best way to contact Freedom Games.

Bright Memory Infinite : October 22 2023 update.

Additional Features

Added Steam Workshop support.
(You can change the following models with the Workshop: Sheila, first-person arms, first-person legs, and guns)



Added mod support.
(You can now access mods from the main menu.)

▼Mod Development Manual:
https://steamcommunity.com/sharedfiles/filedetails/?id=3053538813



Changed the Aim Mode when Perspective-assist is turned on.
(It will now be an over-the-shoulder shot instead of in first-person perspective.)



Added a steam effect to the exoskeleton armor in Perspective-assist Mode for certain actions such as the double jump.


Perspective-assist Mode Optimization

Optimized the dodge animation transition to make it look more natural.
Optimized the dash animation transition to make the switch from walking to dashing look more natural.
Optimized the physics of Sheila's hair to fix most instances where her hair would become longer when using certain skills.
Optimized the Aim Mode so that the crosshair will only zoom in or out when firing in Perspective-assist Mode.


Fixes

Fixed an issue where the toon shader would not work in Introduction and Life and Death.
Fixed an issue where the toon shader would not work during the animation of the sneak attack with the kitchen knife in the stealth mission of Surrounded.
Fixed an issue where the toon shader would not work when climbing.
Fixed an issue where the toon shader rendering settings would not load when continuing the game or starting from a selected scene.
Fixed an issue with the sniper rifle reloading animation in Perspective-assist mode where the magazine would sometimes get stuck on Sheila's arms after reloading.
Fixed an issue in the beginning of The Primordial Flood where there were no walls at the edges of the area.
Fixed a typo in the Simplified Chinese version of the Tips that display on the loading screen.

We're no only on "vanliia". We're on 1.01 2006 Legacy GOG-Exclusive edition. We missed all the patches from 2017 - onward. And hey fixed a little bit in vanila + added some MP / skirmish maps.

Ah, didn't notice that it was updated for Galaxy to 1.05 in 2017.

However, the offline installer is still from 2015, when the game was released on GOG.


I don't care much for MP, but fixes (for the memory problems for example) I would very much like to see.

No, no no.
1.5 is a "base" patch to the normal game.
Empire at War as a normal game was patched from 1.0 to 1.5, and after that left.
Some time later we got Forces of Corruption - in retail it got from 1.0 and got patched to 1.1. Then it was left to rot, until 2017 came and Petrolgyph make empire at war great again or something. As far as i'm aware most mods ignore base game and work under Forces of Corruption program.