I wish I could give a higher review for this game; it has absolutely gorgeous art and music, and an absorbing atmosphere.
It's just some quirks about the game play and hidden items, etc...
Some of the items were hidden to the point where you cannot tell where the hell the are, or that their even there at all, like the ladder in the cave.
Some items are sooooo finicky, I would have to try it multiple times in order for it to work, I tried digging the grave for long enough that I gave up and tried to look up what I was supposed to do, and it turns out it just wouldnt register my clicks, or, something.
The text, excluding the combat, is pretty small, you have to kinda squint to read it, no big deal though. Also, there should be a separate mute button for sound and music. Plus, since there are multiple endings, people will definitely want to see all of them. Put a menu after beating the game, that will give the player the option to start over, or put them in a place where they can easily choose the other ending, so they don't have to reload the entire page.
And, although the art is lovely, I would just change the way dead things are drawn. So, instead of having what looks like a bloody piece of paper in the shape a wolf lying on the ground, you could make them look like they were a living creature; as opposed to a kid pretending to fight off cardboard bears.
I really liked the simplistic, yet alluring story. The only thing I would change is instead of talking about that surviving guy as if it's a news paper article, because it seemed like the person you play as seemed to know him. So, just a little link between the main character and that survivor, along with a little more insight on said main character.
Also, with the shovel near the tree...
How the hell is ANYONE supposed to know that's there?
I checked both by playing through the game a few times, and by watching the walkthrough video, and there is NOTHING there to indicate the tree was hiding something. Nothing. An owl in the tree that hoots when you click on it is not a hint, since other things did the same thing when clicked, and did absolutely nothing.
But, I really liked this game! The art is phenomenal, the sound design is great, and the music alone is very atmospheric and goes well with the art choice. I also liked your idea of using a native american theme; it made it feel a little more atmospheric to talk about it as a legend that's been around for a few hundred years, instead of 'a mysterious figure killed my dad, imma go kill it'.
I hope I see more interesting games with similar art, music, and sound! :D