"such great artwork in so little time?"
Simply put, I didn't.
Most of the art was stolen from my other game and projects.
The game takes place in the same universe as my "interactive-fiction"-type game and my abandoned "point-and-click adventure", so I could reuse a lot of assets.
So, simply put, if there is a way to draw detailed pixel art in a short amount of time, I haven't heard of it :D