Before I start thank you for taking an initiative to make this fangame (since I like the BoF series).
I have found a re-equip bug in the Runes, if the player remove and equip again it's possible to stack the rune effects like the HP one (like 1000 HP to 2000, then 4000, 8000 and go on)
In my case I have found some problems when trying to buy potions in the arena and Wyndia (can't interact with the NPC or even get close to the bench).