Basically what the title describes: what are some good settings for free-roam roguelikes, where you can just wander around and carve your own path, eventually progressing towards the final boss/quest/goal?
I've thought of the usual Fantasy set in Middle Ages kind of idea, plus a post-apocalyptic America, and a sort of 1650 - 1680's Golden Age of Piracy buccaneering type thing, where you sail around on your ship looking to make fame and fortune.
However, I feel like fantasy is just too over-done, post-apocalyptic settings are too politically/emotionally charged, and piracy is largely a team effort, which I don't feel fits with roguelikes in general (one hero that, against all odds, defeats the bad guy).
I really like post-apocalyptic settings, but I don't want to turn it into an allegory of how we need to downsize our nuclear weapons departments, or stop global warming, or protect the koala bear because without it this certain tree will grow too large and take over our cities, etc. It's not that I don't think those things are worth talking about, it's that I want my game to be fun, not a secret anti-nuclear-weapons speech.