Nevermind. I managed to get the secret ending. It turns out that all I had to do was be patient. It's pretty fitting, honestly, considering how the last thing you would have while playing this game is patience, and the secret ending tied up everything really well.
Thank you! It's so great to hear that you liked it, and I'm also glad you've been able to find the secret ending on your own. Over here, notifications come quite late (and through email), so, if you have an immediate hint request, just post it in the #hints channel on my Discord server, or send me a DM on twitter @evonture.