There's no shortage of fantastic Steam roguelikes, and Caves of Qud is one of the top rated for a reason. It's a colossal undertaking that's earned an 'overwhelmingly positive' 95% Steam rating since it launched in early access in July 2015, and a huge update delivers a wealth of new things to do and find. While it might not have the name recognition of Hades, Dead Cells, Spelunky, Dwarf Fortress, or The Binding of Isaac, this is certainly one roguelike you won't want to miss out on.
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Caves of Qud adds massive new dungeon in Tomb of the Eaters update