It's... not clear at all that we actually have a quest in progress, and that clicking a minion displays the quest (or displays anything really). I'd say put an exclamation point or question mark or... something that indicates it's even clickable.
I got to Ramethyst [3rd story-1 dude] before I accidentally clicked on the monster.. Otherwise, solid design. Feels extremely slow but that's probably because I didn't realize there were objectives to meet.
 "Puzzle Fuzz: Idle Stories"){kind=icon}
 "Immense Army"){kind=icon}