The art was really nice, and using a premade art pack during a jam can give super nice results (as it did in yours). The pack works well with the game and it is really cool, so it's not a very big deal, but your other art is super nice too.
I think a post-jam version might benefit from some of your own art (not sure about the style but your hand-drawn looking style is pretty cool) and maybe speech bubbles above the NPCs (I know you had problems with anti-aliasing in pixel art but post-jam it might be fixable).
The idea is great and really fun to play, so it's just these minor things. I loved your game! (and thanks again for your review of mine!)