Where is it, I've looked everywhere

So I finished the game twice. Got the fake finale (Achievement #18) then redid the whole thing, trying to collect as many tapes as possible. (Got 1 to 6 and 8, never managed to figure out how to get the 7th), final boss changed and the ending too. No option to save at the end. Never managed to move those rocks at the very beginning, it's apparently never the right time. So yeah no idea what to do from there, unfortunately....

Report any bugs here so they can be patched!

Oh my god, this game is simply a masterpiece! The artwork should be put in a museum, right next to Van Gogh!

It's scares me, it really does. I've been waiting for it to release for a while. I don't really know what to say, this is one of the few pieces of media about this game that wasn't made by the people who developed it, and somehow, it makes everything even more terrifying....