Welcome to the Beast's Castle, home of old friends and missed treasure chests.
In lieu of making any meaningful commentary on Beast's Castle, I'm going to instead talk about a problem I have with RPGs.
Many times in an RPGs, players will see treasure chests in the level while watching cutscenes. This is good because it gives them something to pay attention to while the characters are busy talking about things not relevant to the main plot.
On the other hand, if the scene changes or they end up behind a point of no return, then it feels like the game is teasing them about the chest they missed.
Remember the player's feelings when placing chests in your game.