So after deliberately buffing the MercRat and inadvertently rendering it unable to Query (and thus me unable to learn it), then running out of non-attack options, I attacked him for one damage. He said "You've made a grave mistake!" and then the game crashed to the TIC console. I haven't managed to get screenshots or copy-paste working, so here's my best stab at a manual copy-over of what was on the console:
>[string "-- title: ROWBYROW..."]:5745: attempt to index a nil value (global 'cur_line') stack traceback: [string "-- title: ROWBYROW..."]:5745: in function 'TIC' [string "-- title: ROWBYROW..."]:5773: in function 'TIC' >
I was also trying to Query as many of the first dungeon enemies as I could, and I haven't managed Slime or Rival yet but I have managed Maneki.
Interesting game so far! Would be easier if you had an actual description of picross rules in the tutorial.