My girlfriend and I ran into a bug in the ancient city where the screen just went completely black after entering the area where the tower of the endless is. She had made a bunch of progress and found a lot of good items at this point and it totally screwed everything. Not to mention a lot of times we will cut an enemy's head off and get attacked before combat ends, and that's by enemies that aren't supposed to be alive after getting their heads hacked off. We really like the game but the bugs have ruined multiple runs for us by now.
Some enemies have the headless chicken effect. It's actually a feature lol. One version had them die instantly but it made the game really a lot easier actually.
I feel bad for ruining your good run! D: the bug near the tower of endless is a new bug that came with the latest version apparently. It's a bit mysterious to me to be honest. Have you tried it again on a seperate run? I'm just curious if it happen every time you go there.