It sounds like you’re just missing the at least one ending, if you’re using skip to go over things it can sometimes miss the ending trigger if you skip the post-credits scene, you need to stop skipping the credits right near the end and let the post-credits play out completely. I think we fixed this bug in the next build we’re working on.
Hm, that’s odd, are you on the mobile version of the game?
After you finish the Selkie ending (the one where Malcolm turns into a seal), when the credits finish (don’t spam click through it on accident), you should be presented with a small scene with seal Malcolm and Grace and a sunken boat. You aren’t seeing this at all?