found out why you cant get to the other routes in the current state of the game: basically; the achievement that unlocks the other routes, the played once achievement, is never written to be granted to the player upon completing any of the endings
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hi! I realized my mistake. The reason why you and others weren't given the endings is because people usually press the "skip the credits" option upon getting to the credits, and I only wrote the granting achievement part if you've watched the credits fully. Don't worry, the simple fix for this is to complete an ending and then choose to watch the credits fully - you can still click the button to "skip" right before the credits start so that you don't have to go through the issue of having to read everything, and then i'm sure the "played once" achievement will be granted. If it still doesn't work, please inform me! Thank you!