The final line of the v104 patch notes, hidden in the code: "You can't lose if you never admit you're playing."
Because this is a fangame, it is not on Steam. You can find the official v104 package on: koishi komeijis defeat cave adventure v104 updated
Stay tuned for a full boss guide on Floor 19’s new "Anomaly" enemy later this week. The final line of the v104 patch notes,
: Reviews generally highlight the "wholesome" yet dark balance the game strikes. Fans of the Koishi Komeiji's Heart-Throbbing Adventure koishi komeijis defeat cave adventure v104 updated
Based on player feedback, v104 adds a new difficulty option at the start: