Hello! You need to extinguish the 4th one before accessing the trapdoor or the other endings. I'll write a little hint to each candle as I don't know in what candle you are stuck.
Grandma: You need to Blind her...
Hanged: Once you turn off his candle you have to take him to 2 specific squares on the map...
Caged: You need a Music Box, You have to do Grandma's candle first.
Doll: You have to find the key in the hole and then open a locked door.
Thank you for your support and I'm sorry for the late answer. Hope you enjoy it!