The first out of the three Chapter 1 Endings is now pretty much done! 

It can unfortunately not yet be achieved natively by progressing through the game, to access it you will have to use the cheating room. 

Cheating room is accessed by choosing not to take the tutorials, travelling to the Swirling tree, waiting for the deer to pass and then travelling backwards. 

Some item functionality and the evaluation system is not yet included, all endings will need to be finished first, as well as a part of Chapter 2. 

But for anyone who wants to see one of the alternative endings to Sarah's story, it's in there.  The ending adds about 40 minutes of gameplay. 

If you just want to see what happens you can do so here: