Yes, there are multiple endings. I'll look into creating a walkthrough after the 3rd game releases (which will be very soon).
Viewing post in To Train A Killer: Last Winter comments
Hey! It took some time, but there's a walkthrough now to help you get all the endings! https://norbez.itch.io/to-train-a-killer-last-winter/devlog/965304/what-to-get-a...