Thanks for playing, and I'm glad you liked what played! Sorry for the errors encountered.
The main objective is to destroy the amulet in the monastery, but you will likely have to kill all the monks to do this. This is a little easier if you engage them one on one.
I wanted to shift from a slightly fun + very easy puzzle to more combat at the end, so I get why you'd be confused. I would have liked to make that shift a little easier to understand, but I didn't want to just tell the player what to do. Also the difficulty spikes there pretty hard, which I'd like to fix. I initially planned simpler enemies, but didn't have time to implement them.
Thanks for picking up the bug with the last axe guy - he's a bit bugged at the moment, hence the error. You don't need to interact with him to advance the story. I'll make it a priority to fix him when the jam is over.