lonespelunker, 
Been looking around at some sprite tilesets on itch, considering using one for 7DRL.
I'm leaning towards the superhero idea, but of course most tilesets are either sidescroller or dungeon-themed.
So I think I'm going to have to adapt one of my own tilesets, like my weird-as-hell 13x13 tileset that I used for "Murder Most Foul".
Or, you know, go old-school ASCII.
Or maybe I go with my TRS-80 style emulation idea and do the superhero thing with it.
Too many options!