Hmmm....I think I disagree with his analysis on why people consider his art "bad". This coming from someone who would rank Dwarf Fortress or Cataclysm: Dark Days Ahead among his favorite games of all time.
Queen's Wish has a very retro square-tile top-down view, reminiscent of old Ultima games, old Pokemon games, Spiderweb's first games, tabletop D&D, that sort of thing. For some, that old style is really unfamiliar and/or alienating.
I think he's honing in on the wrong thing here. Hell, look at something like Caves of Qud, a game from 2015 that still receives updates, and which has significantly more retro artwork and yet still manages to look beautiful (to me, anyway):
It's retro, but it's stylized. It seems aware of the space its graphics exist in, and try to make something that looks good within those arbitrary limitations. I dunno. He's certainly allowed to make his games look exactly how he wants, I just don't think he really understands why people don't like his artwork. Of the five reasons he provides for keeping his artwork in the same conceptual space, only "You Gotta' Follow Your Muse" and "Some People Like Our Games" really felt valid to me.
If he wanted, he could get artwork that is both retro and appealing. This could be cheap, this could be introduced to virtually any product, and this can be humble...But he doesn't want that, and that's fine. He'll continue making the games he wants, and people will continue buying them.
Because...I mean, yeah. Do what you want. They're your games, make them exactly what you want and let people decide if they like them.