Ratopia's soundtrack is basically a calendar you can listen to. This rat colony sim tracks seasons and eras, and the music shifts with every single combination. Early Age spring themes carry this gentle acoustic plucking that feels like morning light in a tiny burrow.
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By Middle Age the arrangements thicken, adding more instrumental layers as your civilization grows. Summer nights versus winter days actually sound different in ways that matter. The seasonal cycling means you never sit in one mood too long, which is sneaky good design for a game you'll sink hours into without noticing.
Modern Age tracks bring in fuller production that rewards your progress sonically. If you play management sims for the vibes, this one gets it.