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For those of you frustrated by GOG not including the full RCR soundtrack (and based on other new game releases like Botanicula and FTL, there will be some), consider that (as far as I can tell) GOG could not have included it without raising the price considerably. Newer game releases in general are selling the soundtrack separately (or with games but for a raised price), because arguably the quality is to the point where (like movie soundtracks) people are willing to pay extra for the music.

For those interested in Retro City Rampage's soundtrack, like with FTL you can get it on Bandcamp:

There appears to be a "limited edition" vinyl record+digital downloads for $33, or simply the digital downloads for $8.