This is your FIRST GAME and you've not only put in the volume controls but also the sensitivity slider, both things that are so often lacking? THANK YOU! I love that you put in multiple endings (I had to hold off on posting this comment until I managed to get 3/3, at last I did!), and the story had me really wanting to see the next step.
It'd be nice to have a key bind to let us advance the dialog, when you're hunting for those other endings its a little frustrating waiting for the dialog to play out at its own pace again, but this is a pretty minor nitpick. I love how you implemented the water, and making the loch ness monster relatively formless rather than heavily textured actually helps add to the creep-factor when it pops up unexpectedly!
(Minor bug - the Main Menu button on the 3/3 ending screen didn't send me back to the main menu. Wasn't a big issue for me since that was me finally getting the last one, just FYI)