A little while back, JD was interviewed by Roguelike Radio about Unexplored. The episode is now live: http://www.roguelikeradio.com/2017/09/episode-139-unexplored.html
We talked about the inspiration for the combat in Unexplored, cyclic generation, puzzle design, and design goals in Unexplored. At the very end JD reveals a little about the design goals for the sequel, too!