Gentle underwater tones that shift as you clean up the ocean. Loddlenaut on PC is basically an alien marine biologist simulator and the music reflects every stage of environmental recovery. "Flotsam Flats (Polluted)" sounds murky and heavy, but once you do the work, "Flotsam Flats (Clean)" opens up into something bright and relieved.
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Same goes for "Grimy Gulf" across its three states. The recovering variants sit in this hopeful middle ground. Not clean yet, but getting there. "Ripple Reef (Recovering)" captures that feeling perfectly. "Drifting Currents" floats through with ambient calm that makes you forget you are playing a game about trash removal in space.
If you want a soundtrack that literally gets better the more you care about the world around you, this is the one.