Thats fair for sure. It should be only specifc deaths that you cant undo. It was meant to keep it from being a click through sim and make people have to actually figure iut the puzzle parts for the harder endings.
Ill take a look tonight and see if I accidentally applied it globally though.
yeah I messed up. Exploration deaths now have the undo button back in, but puzzle/endings that lead to one of the challenge runs to name a character are still permadeath.