drasticontrast: Can we expect the developer to make the changes to the soundtrack here that they've made on Steam?
Snolus: 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?
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)