not need it? just got my self in a cul-de-sac. (need to get double jump sword to continue, backtracking blocked by active gravity sword, gravity sword itself unreachable as well.)
where did this happen? i'm the artist for the game and we don't want any soft-lock possibilities. if you were actually stuck then we can update the game to remove the possibility of a soft-lock in that area. this will be easier for us rather than updating all the puzzles to not be broken by a respawn key
in the tunnel with the third gravity sword, just after the pit with the spiked walls.
also found another soft-lock: if you fall down to the right from the ledge where the first dash sword is found, then you won't be able to take it to the first barrier. (possible solution: place right-side floor higher so that a loaded down double-jump can clear it)