Hi, thanks for playing the game and I'm glad you're enjoying it!
Honestly, I didn't expect people to go that far, so the balance gets a little worse after the castle (but the story gets better imo).
As for the bugs with the walls, making collisions for each tile in a tileset is so tedious that I always make mistakes out of boredom, but I'll pay more attention to that in my next game (which should also be an rpg?).