Hi there! To get the other ending you need to find all 3 Pumpkin keys- the code isn't necessary to beat the game, however it does have a hidden secret for lore! You actually find the code hidden in TWSTM. If you need help with either of those, I'll give you hints and/or the answer if you want! But if you want to try to find it on your own first without spoilers, I won't ruin it^^ Hope you have fun, good luck!