That extra giant jiangshi boss is way too difficult. You need a very specific course of action and a few unretrievable items to actually beat it. It does base 10 damage per round in first phase and 20 more if you break her armour. You get 1 heal per combat.
The second phase deals 20 damage non stop per round and you have to kill the boss (200hp) with no weapons before your health runs out.
Did I miss something? It took me like an hour to beat her.
Other than that the game looks pretty promising. Looking forward to more!