I've purchased Tower of Time on both Steam and GOG. Both make the soundtrack available, however, the GOG version is only 17 tracks at 160 kbps; the Steam version is 32 tracks at 320 kbps. Can we expect the developer to make the changes to the soundtrack here that they've made on Steam?

You would have to ask the devs about that, that's the best anyone can do. (Or GOG support, though I'd suggest devs/publishers first since they tend to know more about what the problem is.)

Side note: The soundtrack's store page on Steam only lists 17 tracks, could you take a screenshot of the 32?


Even worse, they could be making money with it, yet it's not here. Incidentally, some of that content is included as extras with the Velvet Edition.


Added
Kingdom Come: Deliverance
The Flame in the Flood
Two Worlds II

Added Bioshock Infinite. Missing Mac and Linux versions.

Why is Tangledeep on the list?
It's unfair to include it since Mac and Linux is published by different company.

My understanding is that the GOG version is currently behind on updates. (There was a time before when this was an issue.)

Because it's missing a soundtrack.
It's also unfair to not get the Mac and Linux versions just because you are on GOG and not on Steam.

[Repost]
Spec Ops: The Line is missing Mac and Linux builds. Also missing is the multiplayer.

Compare:
https://store.steampowered.com/app/50300/Spec_Ops_The_Line/
https://www.gog.com/game/spec_ops_the_line

Kingdom Come Deliverance Royal DLC package is now out on GOG.

The tracks were subdivided into 3 folders: City, Exploration, and Fight. I don't have a screenshot, since I deleted the game after I grabbed the tracks, but I can give you the titles. Also, search for "OST - missing tracks" in the game discussions on steam; the developer replies that they've updated the soundtrack there.

01. The City of Broken Stones (City)
02. Reclaiming the Forgotten (City)
03. Five Minutes of Sunlight (City)
04. The End Days (City)
05. Into the Tower (Explore)
06. Lost Knowledge (Explore)
07. Among the Friends (Explore)
08. A Place of Wonders (Explore)
09. A Candle in the Darkness (Explore)
10. The Long Descent (Explore)
11. Tales of the Past (Explore)
12. A Glimmer of Hope (Explore)
13. Sanctuary (Explore)
14. Rest for the Weary (Explore)
15. Secrets Long Forgotten (Explore)
16. A Mystery of the Machines (Explore)
17. Exotic Matter (Explore)
18. The End of the Road (Explore)
19. Shadows in the Darkness (Explore)
20. Tower Avatar Story (Explore)
21. Drums of Battle (Fight)
22. The Swarm (Fight)
23. The Rain of Steel (Fight)
24. Strength in Unity (Fight)
25. Surrounded (Fight)
26. Always Victorious (Fight)
27. Against the Odds (Fight)
28. Defy the Fury (Fight)
29. The Dark and the Light (Fight)
30. The Last Stand (Fight)
31. Proteus' Dark Tidings (Fight)
32. A New Day Rises (Fight)

Apologies for the delay!


Thank you, very helpful. :)


Added
Spec Ops: The Line
Tower of Time

Removed Kingdom Come: Deliverance

Apologies that it took 70 years to get back to you, but there was a discussion about this.
Basically, games with modding tools which are only available on Steam go on the list; however, games with mods only available on Steam are more the responsibility of the modder. There is a thread tracking these, however.

On that note, Rise of Industry updated.

Is the Gog version of Mad Games Tycoon updated ?

All I can find is Traditional Chinese missing and a small update https://steamcommunity.com/app/341000/discussions/0/1769259642860143568/

Thanks .

There's no apology needed. :) I see you guys working overtime on The List.
If the game supports steam clients at the cost of clients of other stores then I blame the game creators. In the end, they take the money. Most modders works for free in their free time and have no obligation to other people.
I don't want to start new discussion here. If you say that games with steam-only mods shouldn't be on the list then I'm OK with that. That leads me to my second post about Opus Magnum. Should the game be removed from the list for the reasons you mentioned? Is this game there because of the mods or are there other problems?