Sorry, I've never played the game myself. Checked it quickly: it actually already has quite good music in it. So I don't see what I should add/change there.
Edit:
While checking the game I "had to" cheat the game a little - I unlocked the Gallery...
So if someone else need that, here's the Mod for it.
Info: the Mod is OFF per default, to unlock it there's a little Mod button on top of the Gallery entries
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Jan. 25, 2023:
Updated my Mod for the new, final game version v1.0
(Info: no new entries since the v0.99beta)
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Download Gallery cheat Mod v1.0 (<1MB)
Workupload -
You must be registered to see the links
Ingame pics of the Mod:
View attachment 2337688
View attachment 2337689