Gameplay flaws...
There is no way to revive a fallen companion or restore to a save before she died and the game can be impossible without her. I kept my first companion alive until very late in the game. She was getting more kills than I was, with her AK-47 or other automatic weapons (me with the sword). She died due to a bug - when I moved to another screen somehow 5 zombies were all on top of her at the very left corner of the screen.
Now even though I have level 92 skill in edged weapons and a katana, plus 20 luck for max crits, some enemies I can only do 1 damage to no matter how many times I hit them... even when I crit I only do 1 damage. Against a normal enemy a crit would do 135 damage.
The game is now unwinnable. Thanks, Con-Artists!