Thanks for playing again! Sorry for the boss bug, indeed he should sacrifice his minions, not the player.
Each treasure is supposed to be a puzzle solvable with little to no damage taken, but can be very easy if you have certain cards.
For example the one with the flaming stairs with basic deck goes something like: shield up to 3, shift to the ledge, walk up the ledge and restore shield every turn, shift to the safe ledge, kill the ice enemy (douses fire), jump to the newly made safe tile, shield up, walk the rest of the flame path to the treasure.
Or if you have some substance flask in you items, or a rain spell, or a long teleport it becomes trivial.
I'm adding more mobility (the new Untether card grants free movement for example), but also I might add interactible elements that will make the player want to move more.
Thanks for feedback! Cheers!