Yeah, that's a good idea. I'll definitely add a retry/suicide button for bosses.
Glad you liked the Puzzle Difficulty room! :D That whole part was inspired largely by Silent Hill 3, whose hardest "riddle difficulty" setting features some notoriously obtuse puzzles which sometimes require relatively esoteric knowledge from the real world; the very first puzzle in SH3 is the "Shakespearian Anthology Puzzle", to give you a sense of what it's like.