Dunegons are definitely important, as you can see by each Cursed Scroll (since there are always dungeons in addition to the exploration stuff).Is 'shadowdarky' just more dungeon crawl to you? Would you classify Cursed Scroll 4 as Shadowdarky? Its got some weird, some grim, some dark, but also is just a cool jungle adventure.
I would be interested to hear what you think is "shadowdarky" about Spelljammer.I too think its at least partially about a 'simple 5e' among other motivations, but I dont think the game is that tied to the dungeon either. I have my SD Spelljammer on the way for example.

