ciemnogrodzianin: Thanks, guys, for all the opinions and recommendations.
Initially I wasn't interested in any of these. Now I own 3 of them :D
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Rhiannon – because of Panaias, my dear fellow adventurer ;), opinion and Myst-like gameplay.
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Nikopol – because of argamasa, my another dear fellow adventurer ;), recommendation and Benoît Sokal!
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Space Hack – looks like unique crpg/arpg.
Larva Mortus has great music in trailer, but it seems there's no music during the actual gameplay (checked on YT), so, well, nope.
I tried it and I could hear atmospheric music during a mission/level. Also
Maybe you watched a silent bit or that YTer had turned it off.