btw guys, if you plan to unlock more powerful weapons in this game, you need to finish the story first and finish the castle side story 3 times(this side story will unlock once you finished the main story of the game, in order to get this side quest, you need to ask someone who wears a robe and black hat at the village in front of the loan building, you will see this new character appear in that village) because it will give you good startup powerful weapons, and if you enter the shrine tower this requires strategy because the mob level in the shrine tower are fking tough like a large amount of health and you need more traps in order to slow down the enemy advance towards you, once you finish 3 levels in the shrine tower it will give you RANDOM reward but if you didnt die and respawn in shrine tower possibly it will give a main powerful weapon better version of the weapon(this is likely end game content because i have finish this game few weeks ago but i got annoyed, how tough these enemies are in shrine tower so i decided stop playing that final endgame content).
im not sure if there's another secret ending in this game but so far including the castle building, i have unlock all the scenes in the game and all level maps.